Consulta: subjectFacets:"Cluster analysis"
Registros recuperados: 140
Data/hora: 05/06/2024 17:25:27

Caracterización morfológica y agronómica de once híbridos de Brachiaria ssp
Provedor de dados: 32
Autores: Peralta Nava, Jorge Armando.
La presente investigación se realizó en dos etapas para caracterizar y evaluar a  once híbridos de Brachiaria spp.  En la primera etapa se evaluó la producción y calidad de semilla en  campo y  laboratorio. En  campo se utilizó un diseño de bloques al azar evaluándose el  rendimiento de semilla ventilada (RDSV) y  la densidad de tallos florales (DTF). Los  híbridos LNN45 y HBA-69 obtuvieron los mayores RDSV (218.02 y 207.33 kg ha-1  respectivamente). En DTF los mejores híbridos fueron, HBA- 43 y HBA-73 (695 y  606.50 DTF/m2). No hubo una asociación entre RDSV y DTF, lo que hace del llenado  de grano un atributo variable en este género. En laboratorio, se evaluó la semilla  cosechada por método sudado (MCS) y método manual (MCM), en un diseño  completamente...
Tipo: Tesis
Palavras-chave: Brachiaria spp.; Híbridos; Caracterización morfológica; Componentes principales; Conglomerados; Maestría; Producción de semillas; Hybrids; Morphologic characterization; Principal; Components; Cluster analysis.
Ano: 2009
URL: http://hdl.handle.net/10521/1255

Caracterización morfológica, estudio molecular y determinación de azúcares en zapote mamey (Pouteria sapota Jacq. H.E. Moore &amp; Stearn).
Provedor de dados: 32
Autores: Arellano Durán, Nely.
La importancia del zapote mamey radica en el valor comercial de sus frutos por su uso en la alimentación humana debido a sus características organolépticas y nutricionales. México es centro de origen de este frutal, distribuyéndose en 15 estados de la república, su propagación ha sido por semilla por lo cual existe gran diversidad genética. El objetivo del presente estudio fue hacer la caracterización morfológica de 12 selecciones provenientes de Puebla, Veracruz y Yucatán, así como el estudio molecular mediante la técnica AFLP`s incluyendo siete materiales de Guerrero y cuatro especies de la familia de las Sapotáceas (Pouteria campechiana, P. fossicola, Manilkara zapota y Chrisophyllum cainito. También se determinó el perfil y concentración de azúcares en...
Palavras-chave: Pouteria sapota; Diversidad; Análisis de conglomerados; Marcadores moleculares; Azúcares; Estaquiosa; Diversity; Cluster analysis; Molecular markers; Sugar; Stachyose; Fruticultura; Maestría.
Ano: 2012
URL: http://hdl.handle.net/10521/1091

Aplicación de métodos multivariados para la tipificación y caracterización de almacenes de maíz en México.
Provedor de dados: 32
Autores: Ortíz Rosales, Miguel Angel.
El principal cultivo en producción, importaciones y consumo en México es el maíz, su correcto almacenamiento permite hacerlo disponible en todo momento, incide directamente en la seguridad alimentaria del país, permite hacer más competitiva la oferta y es un detonante de ingresos y empleos. Por otro lado, la oferta de maíz en México se encuentra dispersa por todo el país y entre propietarios con distintos niveles de desarrollo; en consecuencia, las características de los almacenes pueden obedecer a varios factores. En este contexto, las políticas dirigidas a eficientar el sistema de almacenamiento de maíz en México deben considerar dicha heterogeneidad. En este estudio se propone una tipología de almacenes de maíz que permite agrupar características en...
Palavras-chave: Seguridad alimentaria; Análisis de componentes principales (ACP); Análisis clúster; Economía; Doctorado; Food security; Principal component Analysis (PCA); Cluster analysis.
Ano: 2012
URL: http://hdl.handle.net/10521/1780

Cultural Ecosystem Services: A Literature Review and Prospects for Future Research
Provedor de dados: 7
Cultural ecosystem services constitute a growing field of research that is characterized by an increasing number of publications from various academic disciplines. We conducted a semiquantitative review of publications explicitly dealing with cultural ecosystem services. Our aims were: (1) to provide an overview of the current state of research, (2) to classify the diversity of research approaches by identifying clusters of publications that address cultural ecosystem services in similar ways, and (3) to highlight some important challenges for the future of cultural ecosystem services research. We reviewed 107 publications and extracted 20 attributes describing their type and content, including methods, scales, drivers of change, and trade-offs between...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Aesthetic values; Bundling; CES valuation; Cluster analysis; Cultural heritage; Cultural landscapes; Drivers of change; Intangible benefits; Landscape values; Nonuse values; Policy implications; Recreation and ecotourism.
Ano: 2013

Molecular description and similarity relationships among native germplasm potatoes (Solanum tuberosum ssp. tuberosum L.) using morphological data and AFLP markers
Provedor de dados: 69
Autores: Solano Solis,Jaime; Morales Ulloa,Daniza; Anabalón Rodríguez,Leonardo.
Chile is considered to be a sub-center of origin for the cultivated potato, with native and introduced genetic material coexisting in the country. Thus, the different varieties present in Chiloe Island are characterized by a rich diversity of forms, sizes, colours and phenological characteristics. In the present work, the level of polymorphism and the genetic relationship were studied by means of molecular markers using the amplified fragment length polymorphism (AFLP) technique and twenty-seven morphological characters. Twenty varieties of potatoes from the Chiloe Island were analyzed. The commercial variety Desirée and one specie from the Etuberosa series, Solanum fernandezianum, collected in the Juan Fernandez Island were included as controls. A...
Tipo: Journal article
Palavras-chave: Cluster analysis; Molecular markers; Solanum tuberosum ssp. tuberosum.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300011

Inter simple sequence repeats separate efficiently hemp from marijuana (Cannabis sativa L.)
Provedor de dados: 69
Autores: Hakki,Erdogan E; Kayis,Seyit A; Pinarkara,Emine; Sag,Ayla.
Cannabis sativa L. is a multiple-use plant that provides raw material for the production of seed oil, natural fiber for textiles, automotive and pulp industries. It has also been used in insulating boards, ropes, varnishes, animal feed, and as medicinal agents. Cannabis has potential to be used for phytoremediation: however, its cultivation is strictly controlled due to its psychoactive nature and usage in producing drugs such as marijuana, and hashish. In this study, psychoactive type Cannabis samples, which were seized from 23 different locations of Turkey, and nine hemp type Cannabis accessions, as well as an unknown accession were used. Our interest was to identify the genetic relatedness of the seized samples and to separate drug and hemp type plants....
Tipo: Journal article
Palavras-chave: Cluster analysis; Hemp; ISSR; Marijuana; Principle coordinate analysis.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400010

Cotton genetic diversity study by AFLP markers
Provedor de dados: 69
Autores: Murtaza,Naveed.
Amplified fragmentlength polymorphism (AFLP) markers have been used to ascertain the intensity of inherent diversity and relatedness in cotton (Gossypium spp.) plants. The effectiveness of this method to distinguish inter and intra specific difference in cotton could be handy in cultivar recognition and in marker assisted parental selection tool for plant breeders. Twenty cotton cultivars belonging to Gossypium hirsutum L., and G. arborium L. from the Pakistan and US origin were used for AFLP based genetic diversity estimates. The objective of this study was to assess the level of genetic variation among some cotton cultivars belonging to the old and new world species of cotton. Four EcoRI-MseI primer-pair combinations were used forthe AFLP analysis. The...
Tipo: Journal article
Palavras-chave: AFLP; Cluster analysis; Cotton; Genetic diversity; PCR.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400013

RAPD analysis of seized marijuana (Cannabis sativa L.) in Turkey
Provedor de dados: 69
Autores: Pinarkara,Emine; Kayis,Seyit A; Hakki,Erdogan E; Sag,Ayla.
Cannabis sativa L. is a multiple-use plant. However, its cultivation is strictly controlled due to its psychoactive nature and usage in producing drugs such as marijuana, and hashish. In this study, psychoactive type Cannabis samples, which were seized from 29 different locations of Turkey, were used. Interests were to identify the genetic relatedness of the seized samples and to partition molecular variance between and within populations. Randomly Amplified Polymorphic DNAs were employed for analysis based on single plant material and bulked samples of them. Data were analysed via cluster and principal coordinate analyses (PCoA). Analysis of molecular variance (AMOVA) was performed to obtain variations between and within populations. Cannabis accessions...
Tipo: Journal article
Palavras-chave: AMOVA; Cluster analysis; Individualization of seized marijuana; Principle coordinate analysis; Randomly amplified polymorphic DNA; UPGMA.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000100005

Assessment of genetic diversity and relationships among Osmanthus fragrans cultivars using AFLP markers
Provedor de dados: 69
Autores: Yuan,Wang Jun; Han,Yuan Ji; Dong,Mei Fang; Shang,Fu De.
This study was conducted to reveal genetic diversity among 100 Osmanthus fragrans cultivars using amplified fragment length polymorphism (AFLP) markers. Eight AFLP primer combinations produced a total of 443 polymorphic fragments with an average of 64 per primer combination. The percentage of polymorphic bands (86.81%), the resolving power (Rp) (32.71) and the PIC values (0.331) showed the efficiency of used primer combinations. The revealed AFLP makers were effective in distinguishing all the cultivars considered. Cluster analysis were performed to assess patterns of diversity among cultivars and showed the abundant genetic diversity. The overall distribution pattern of molecular variation suggested that 93.33% of the total genetic variance was within the...
Tipo: Journal article
Palavras-chave: AFLP marker; Cluster analysis; Genetic diversity; Osmanthus fragrans.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100002

PHYSICAL ANALYSIS OF REGIONALIZED FLOW AS AN AID IN THE IDENTIFICATION OF HYDROLOGICALLY HOMOGENEOUS REGIONS
Provedor de dados: 70
Autores: Calegario,Arthur T.; Pruski,Fernando F.; Ribeiro,Rayssa B.; Ramos,Maria C. A.; Rego,Fernando S.
ABSTRACT Regionalization is an important technique for estimating the flow of hydrographic sections with a lack of data. First, it is necessary to identify hydrologically homogeneous regions (HHRs), which are commonly validated via statistical analyses. Because this step is understood to be subjective, studies that contribute to a greater reliability in identifying regions are needed. In this context, the objective was to evaluate the inclusion of a physical analysis of the average regionalized flow rates as an aid to identify HHRs. The groupings were defined on the basis of geographical convenience methods and cluster analysis. For the assessment of regionalized flows, six statistical indices were used with a physical analysis that was performed via a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Regionalization; Long-term average streamflow; Planning and management of water resources; Cluster analysis; Geographical convenience.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000300334

Soil penetration resistance analysis by multivariate and geostatistical methods
Provedor de dados: 70
Autores: Medina,Cecilia; Camacho-Tamayo,Jesús H.; Cortés,César A.
The penetration resistance (PR) is a soil attribute that allows identifies areas with restrictions due to compaction, which results in mechanical impedance for root growth and reduced crop yield. The aim of this study was to characterize the PR of an agricultural soil by geostatistical and multivariate analysis. Sampling was done randomly in 90 points up to 0.60 m depth. It was determined spatial distribution models of PR, and defined areas with mechanical impedance for roots growth. The PR showed a random distribution to 0.55 and 0.60 m depth. PR in other depths analyzed showed spatial dependence, with adjustments to exponential and spherical models. The cluster analysis that considered sampling points allowed establishing areas with compaction problem...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Cluster analysis; Principal components; Andisol.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100010

Multivariate statistical analysis to support the minimum streamflow regionalization
Provedor de dados: 70
Autores: Elesbon,Abrahão A. A.; Silva,Demetrius D. da; Sediyama,Gilberto C.; Guedes,Hugo A. S; Ribeiro,Carlos A. A. S.; Ribeiro,Celso B. de M.
ABSTRACT This study aimed to develop a methodology based on multivariate statistical analysis of principal components and cluster analysis, in order to identify the most representative variables in studies of minimum streamflow regionalization, and to optimize the identification of the hydrologically homogeneous regions for the Doce river basin. Ten variables were used, referring to the river basin climatic and morphometric characteristics. These variables were individualized for each of the 61 gauging stations. Three dependent variables that are indicative of minimum streamflow (Q7,10, Q90 and Q95). And seven independent variables that concern to climatic and morphometric characteristics of the basin (total annual rainfall – Pa; total semiannual rainfall...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Principal component analysis; Cluster analysis; Homogeneous regions.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000500838

Wavelet-domain elastic net for clustering on genomes strains
Provedor de dados: 74
Autores: Ferreira,Leila Maria; Sáfadi,Thelma; Ferreira,Juliano Lino.
Abstract We propose to evaluate genome similarity by combining discrete non-decimated wavelet transform (NDWT) and elastic net. The wavelets represent a signal with levels of detail, that is, hidden components are detected by means of the decomposition of this signal, where each level provides a different characteristic. The main feature of the elastic net is the grouping of correlated variables where the number of predictors is greater than the number of observations. The combination of these two methodologies applied in the clustering analysis of the Mycobacterium tuberculosis genome strains proved very effective, being able to identify clusters at each level of decomposition.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elastic net; Genome; GC-content; Cluster analysis; Wavelet transform.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000500884

Genetic variability in Brazilian wheat cultivars assessed by microsatellite markers
Provedor de dados: 74
Autores: Schuster,Ivan; Vieira,Elisa Serra Negra; Silva,Glacy Jaqueline da; Franco,Francisco de Assis; Marchioro,Volmir Sérgio.
Wheat (Triticum aestivum) is one of the most important food staples in the south of Brazil. Understanding genetic variability among the assortment of Brazilian wheat is important for breeding. The aim of this work was to molecularly characterize the thirty-six wheat cultivars recommended for various regions of Brazil, and to assess mutual genetic distances, through the use of microsatellite markers. Twenty three polymorphic microsatellite markers (PMM) delineated all 36 of the samples, revealing a total of 74 simple sequence repeat (SSR) alleles, i.e. an average of 3.2 alleles per locus. Polymorphic information content (PIC value) calculated to assess the informativeness of each marker ranged from 0.20 to 0.79, with a mean of 0.49. Genetic distances among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Germplasm; Cultivar characterization; Cluster analysis; Molecular markers.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300019

Cytogenetic study of the genus Cousinia (Asteraceae, section Serratuloideae) in Iran
Provedor de dados: 74
Autores: Sheidai,Masoud; Mehdigholi,Kazem; Ghahreman,Ahmad; Attar,Farideh.
Meiotic studies of ploidy level, chromosome paring and chiasma frequency were performed on 11 Cousinia (Asteraceae) species of the section Serratuloideae. The diploid number of the species studied was 2n = 2x = 24 and 26 so these species possess two different basic numbers (x = 12 or 13), a phenomenon common to other sections of the genus. The chromosome numbers of 9 species are reported here for the first time. When the 2n = 24 and 2n = 26 species were subjected to cluster analysis based on relative meiotic characters two different clusters were formed indicating their distinctness. Our data support the results obtained from morphometry, anatomy, pollen morphology and molecular studies of the genus Cousinia.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cousinia; Chiasma frequency; Cluster analysis; Meiosis.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000100022

Molecular characterization and genetic structure of the Nero Siciliano pig breed
Provedor de dados: 74
Autores: Guastella,Anna Maria; Criscione,Andrea; Marletta,Donata; Zuccaro,Antonio; Chies,Luigi; Bordonaro,Salvatore.
Nero Siciliano is an autochthonous pig breed that is reared mainly in semi-extensive systems in northeastern Sicily. Despite its economic importance and well-appreciated meat products, this breed is currently endangered. Consequently, an analysis of intra-breed variability is a fundamental step in preserving this genetic resource and its breeding system. In this work, we used 25 microsatellite markers to examine the genetic composition of 147 unrelated Nero Siciliano pigs. The total number of alleles detected (249, 9.96 per locus) and the expected heterozygosity (0.708) indicated that this breed had a high level of genetic variability. Bayesian cluster analysis showed that the most likely number of groups into which the sample could be partitioned was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Coancestry; Intra-breed genetic variation; Microsatellites; Nero Siciliano pig breed.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400010

Genetic differentiation and geographical Relationship of Asian barley landraces using SSRs
Provedor de dados: 74
Autores: Naeem,Rehan; Dahleen,Lynn; Mirza,Bushra.
Genetic diversity in 403 morphologically distinct landraces of barley (Hordeum vulgare L. subsp. vulgare) originating from seven geographical zones of Asia was studied using simple sequence repeat (SSR) markers from regions of medium to high recombination in the barley genome. The seven polymorphic SSR markers representing each of the chromosomes chosen for the study revealed a high level of allelic diversity among the landraces. Genetic richness was highest in those from India, followed by Pakistan while it was lowest for Uzbekistan and Turkmenistan. Out of the 50 alleles detected, 15 were unique to a geographic region. Genetic diversity was highest for landraces from Pakistan (0.70 ± 0.06) and lowest for those from Uzbekistan (0.18 ± 0.17). Likewise,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Genetic diversity; Geographical differentiation; Hordeum vulgare; Principal component analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000200017

Divergência genética em uma população de melhoramento de cajueiro.
Provedor de dados: 14
Autores: MELO, D. S.; MAIA, M. C. C.; VIDAL NETO, F. das C.; BARROS, L. de M.; CRUZ, C. D.; OLIVEIRA, L. C. de; ARAÚJO, L. B. DE; MEDINA, L. M.
A seleção de genitores com ampla dissimilaridade genética é condição fundamental para obtenção de híbridos com maiores efeitos heteróticos. O objetivo deste trabalho foi avaliar a divergência genética de progênies de cajueiro-comum, pertencentes à população de melhoramento de meios-irmãos, e identificar grupos superiores e dissimilares para as variáveis agronômicas.
Tipo: Folhetos
Palavras-chave: Análise de agrupamento; Plant Genetic Improvement; Anacardium Occidentale; Melhoramento Genético Vegetal; Cluster analysis; Cashew fruit.
Ano: 2022
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1144111

Technological profile of beef cattle farms in Brazilian biomes.
Provedor de dados: 14
Autores: FASIABEN, M. do C. R.; ALMEIDA, M. M. T. B.; MAIA, A. G.; OLIVEIRA, O. C. de; COSTA, F. P.; BARIONI, L. G.; DIAS, F. R. T.; MOREIRA, J. M. M. A. P.; SENA, A. L. dos S.; SANTOS, J. C. dos; LAMPERT, V. do N.; OLIVEIRA, P. P. A.; ABREU, U. G. P. de; GREGO, C. R.
Abstract - Beef production in Brazil is based on a great diversity of production systems. Despite the increasing in recent years, productivity is still low, giving space to technological intensification. The present study used special tabulations of Brazilian Census of Agriculture - 2006 to describe the predominant beef cattle systems, with emphasis on technological variables. Factor analysis and clustering techniques were used together, by biome, covering a universe of 124 thousand farms, 94 million heads of cattle and 86 million hectares of pasture. The results highlight the productivity differences among regions and farms, outlining the farm profiles per biome. Such results can be helpful to support research and technologies transfer, as well as public...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Bioma; Análise multivariada; Análise fatorial; Análise de cluster; Produção de bovinos; Tipificação de municípios; Sistemas de produção; Tipologia de fazendas; Factorial analysis; Farms and Farming Systems; Farming systems; Farm typology; Multivariate analysis; Cluster analysis.
Ano: 2020
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1127930

Uma estratégia para auxiliar a identificação de portfólios por meio de mineração de textos.
Provedor de dados: 14
Autores: MOURA, M. F.; EVANGELISTA, S. R. M.; MASSRUHÁ, S. M. F. S.; SANTOS, T. T.
Neste trabalho utilizou-se uma estratégia com base em mineração de textos para fornecer uma indicação dos atuais portfólios da Embrapa Informática Agropecuária. Para tanto, utilizaram-se, como dados, os projetos liderados por essa unidade nos últimos anos, de 2004 a 2010. A esses dados aplicou-se um processo de extração semiautomática do conhecimento, utilizando vocabulário controlado, filtragem estatística de atributos, agrupamento hierárquico de documentos, descrição única dos agrupamentos e várias interações usuários do processo. Os resultados obtidos foram satisfatórios, tendo passado apenas por validação subjetiva, mostrando que o processo pode ser aplicado a dados semelhantes.
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Mineração de textos; Portfólios; Aprendizado de máquina; Seleção de atributos; Agrupamento de documentos; Descrição de agrupamentos; Text mining; Cluster analysis.
Ano: 2011
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/920208

Metodologia para sugestão de grades amostrais mínimas para monitoramento da variabilidade espacial de videiras.
Provedor de dados: 14
Autores: SPERANZA, E. A.; GREGO, C. R.; GEBLER, L.
Resumo - Na fruticultura, onde as áreas de produção são muito pequenas quando comparadas com as culturas de grãos, a representatividade de uma grade de amostras ideal para a aplicação da geoestatística é muito densa com relação ao que é utilizado na agricultura de precisão (AP) tradicional, o que torna a amostragem uma atividade extremamente cara ao produtor. Assim, metodologias que pretendem propor um número mínimo de amostras necessárias para o estabelecimento de atividades voltadas a AP, considerando a representação satisfatória da variabilidade espacial da área e o custo da coleta de dados e análise são importantes para tomadas de decisão com relação ao manejo. Este trabalho teve como objetivo principal estabelecer uma metodologia, baseada em análise...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Geoestatística; Análise de agrupamento; Vitivinicultura; Videira; Uva; Viticulture; Precision agriculture; Geostatistics; Cluster analysis.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1137878

Tipificação de municípios produtores de bovinos no Brasil.
Provedor de dados: 14
Autores: FASIABEN, M. do C. R.; SANTUCCI, J. M.; MAIA, A. G.; ALMEIDA, M. M. T. B.; OLIVEIRA, O. C. de; BARIONI, L. G.
Resumo: Num país com as dimensões do Brasil é muito acentuada a variabilidade dos sistemas de produção agropecuária praticados pelos produtores. Conhecer esta diferenciação é fundamental para propor linhas de pesquisa, desenvolvimento, transferência de tecnologia e políticas públicas apropriadas. Dados do Censo Agropecuário brasileiro de 2006, realizado pelo Instituto Brasileiro de Geografia e Estatística (IBGE), mostram que mais da metade dos estabelecimentos agropecuários do país possuíam pelo menos um bovino, correspondendo a 2,7 milhões de estabelecimentos e 176,1 milhões de cabeças. Este trabalho trata da classificação e caracterização dos municípios produtores de bovinos no Brasil, empregando técnicas de análise multivariada (análise fatorial e de...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Análise fatorial; Análise de cluster; Produção de bovinos; Tipologia de municípios.; Estatística.; Statistics; Cluster analysis; Cattle.
Ano: 2013
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/981008

Tutorial TaxTools.
Provedor de dados: 14
Autores: MORETTI, C. J. P.; PEIXOTO, B. M.; MOURA, M. F.
A ferramenta TaxTools foi desenvolvida pelo Laboratório de Inteligência Computacional (Labic) do Instituto de Ciência Matemática e de Computação (ICMC) da Universidade de São Paulo (USP), campus de São Carlos, SP, com o objetivo de auxiliar no processo de mineração de textos. Atualmente, ela tem sido mantida e evoluída pelo Laboratório de Inteligência Computacional (LabIC) da Embrapa Informática Agropecuária. Esse tutorial abrange apenas as opções disponíveis na TaxTools, que completam o processo de obtenção de uma taxonomia de tópicos (MOURA et al., 2008); como clusterização, cálculos de medidas intercluster e de joinability, métodos de podas, métodos de visualização de resultados e algumas opções auxiliares.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Recuperação da informação; Mineração de textos; Agrupamento de documentos; Cortes de agrupamento; Visualização de agrupamentos; Descrição de agrupamentos; Clusterização; Cluster analysis; Information retrieval.
Ano: 2010
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/882099

Space-time clustering of mortality notifications in Pacific oysters of Charente sluices, France, 2008-2010
Provedor de dados: 5
Autores: Lupo, Coralie; Mandard, Yann-vari; Arzul, Isabelle; Francois, Cyrille; Garcia, Celine; Renault, Tristan; Bareille, Nathalie.
Current monitoring of exceptional mortality events of oysters in France consists in passive surveillance, leading to delayed investigation of causation by scientists and management by policy makers. Early detection of clusters of mortality events in time and space would increase possibilities for their investigation and management. A space-time cluster analysis of existing mortality notifications in Pacific oysters was conducted in France, Charente sluices, from 2008 to 2010. As an example of potential demographic confounder of clustering, the analyses were adjusted on oyster age. Several clusters were identified in space and time each studied year. Patterns of mortality notifications were consistent with the introduction and spread of a contagious disease...
Tipo: Text
Palavras-chave: Notification; Oyster; Mortality; Cluster analysis; Saptiotemporal.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00058/16915/14393.pdf

Are commercial logbook and scientific CPUE data useful for characterizing the spatial and seasonal distribution of exploited populations? The case of the Celtic Sea whiting
Provedor de dados: 5
Autores: Verdoit, Marion; Pelletier, Dominique; Bellail, Robert.
A statistical approach is proposed to utilize the information contained both in scientific surveys and commercial fishing logbooks, in order to determine spatial and temporal distributions of recruiting and spawning fish of exploited populations. The approach is based on multivariate descriptive methods including ordination methods and classification techniques. A typology involving a principal component analysis (PCA), followed by a hierarchical ascending classification (HAC), is applied to both scientific and commercial data. PCA that accounts for spatial and temporal contiguities were performed. These analyses allow to compare structures observed at global and local scales, with those observed without focusing on a particular scale. The method is...
Tipo: Text
Palavras-chave: Contiguity analysis; Cluster analysis; Factorial analysis; Atlantic Ocean; Whiting; Survey data; Commercial catch and effort data; Stock assessment; Bottom trawl survey design.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2005/publication-335.pdf

Effects of the proximity from an industrial plant on fish assemblages in the rio Paraíba do Sul, southeastern Brazil
Provedor de dados: 83
Autores: Pinto,Benjamin Carvalho Teixeira; Peixoto,Magna Galvão; Araújo,Francisco Gerson.
This work aims to analyze changes in the fish assemblages along a longitudinal reaches of the rio Paraíba do Sul, one of the most used Brazilian aquatic systems, to assess the river "health" and to identify eventual recovery trends. Standardized monthly samplings were carried out at six sites, from October 1997 to September 1999, using casting, sieves, seine and gill nets. Three zones were searched: upstream (Z I), downstream (Z III) and nearby the source of pollution (Z II). Three univariate distribution methods were used: ABC (abundance-biomass curves), K-dominance curves, and geometric class's distribution. Additionally, cluster analysis was applied to detect eventual patterns. The ABC and K-dominance curves showed Z II with evident indication of stress...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish community; Neotropical fauna; Pollution; Water quality; ABC curves; Cluster analysis.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200013

牛肉生産における飼料自給率向上の利点に関する消費者評価
Provedor de dados: 19
Autores: 澤田, 学; 合崎, 英男; 佐藤, 和夫; SAWADA, Manabu; AIZAKI, Hideo; SATO, Kazuo.
本稿の目的は，牛肉生産における飼料自給率向上の利点に関する消費者評価を検討することである。Best-Worst 選択質問実験を用いて牛肉生産における飼料自給率向上の利点に関する消費者の評価を測定する調査を，首都圏在住の618名を対象に2008年3月に実施した。分析の結果，回答者全体としては，「エサに対する安心感」が飼料自給率の向上で最も重視される項目であるが， 評価パターンによって回答者は３つの群に分けられることがわかった。さらに，評価パターンには，回答者の，倹約志向ならびに食の安全志向といった態度が顕著に影響することが確かめられた。The purpose of this paper was to verify consumers’ evaluations of the advantages of improving feed selfsufficiency in beef production. The survey, measuring consumers’ evaluations of the advantages of improving feed self-sufficiency in beef production using Best-Worst choice experiments, was conducted in March 2008 (n=618) in the Tokyo metropolitan area of Japan. The analysis of the survey data suggests that the respondents can be divided into three categories by the evaluation patterns, but...
Palavras-chave: 牛肉; 飼料自給; Best-Worst 尺度構成法; クラスター分析; 多項ロジット分析; Beef; Feed self-sufficiency; Best-Worst scaling method; Cluster analysis; Multinominal logit analysis.
Ano: 2010
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2721

Climate Zoning for experimental plantation of Pinus maximinoi in the State of São Paulo, Brazil
Provedor de dados: 190
Autores: Fritzsons, Elenice; Aguiar, Ananda Virginia de; Grabias, Jeniffer; Freitas, Miguel Luiz Menezes de; Wrege, Marcos Silveira; Mantovani, Luis Eduardo.
The state of São Paulo has a wide climatic diversity which certainly influences productivity and species adaptation in forest plantations and places for plantation and experimentation must be carefully chosen. The objective of this study was to identify climatically homogeneous regions in the state of São Paulo, based on data collected at several experimental stations of São Paulo State Forest Institute to support deployment of Pinus maximinoi for experimental plantings. Thirty experimental areas and climatic data for each meteorological station were subjected to cluster analysis interpreted according to the resulting dendrograms. Climatic requirements for this species were verified in the scientific literature and assessed in experimental plantings. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Melhoramento florestal; Pinus; Análise de agrupamento Thinleaf pine; Tree breeding; Cluster analysis.
Ano: 2012
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/304

Contribution of production and seed variables to the genetic divergence in passion fruit under different nutrient availabilities
Provedor de dados: 86
Autores: Rodrigues,Daniele Lima; Viana,Alexandre Pio; Vieira,Henrique Duarte; Santos,Eileen Azevedo; Silva,Fernando Higino de Lima e; Santos,Carlos Lacy.
Abstract: The objective of this work was to evaluate the relative contribution of variables related to fruit production and to seed morphophysiological characteristics to the genetic divergence in passion fruit (Passiflora edulis) progenies, aiming at selecting progenies potentially responsive to fertilization. Ten progenies were evaluated under conditions of low (50% of the recommended dose of fertilizers) and high soil fertility (dose 50% higher than the recommended one), regarding variable sets related to production and to the morphological and physiological characteristics of seeds. The association between these sets was determined by the canonical correlation analysis and by the nearest-neighbor clustering method. The nutritional environments...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora edulis; Canonical analysis; Cluster analysis; Fruit quality; Responsiveness to fertilization; Seed physiological quality.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000800607

Genetic diversity in table grapes based on RAPD and microsatellite markers
Provedor de dados: 86
Autores: Leão,Patrícia Coelho de Souza; Motoike,Sérgio Yoshimitsu.
The objective of this work was to analyze the genetic diversity of 47 table grape accessions, from the grapevine germplasm bank of Embrapa Semiárido, using 20 RAPD and seven microsatellite markers. Genetic distances between pairs of accessions were obtained based on Jaccard's similarity index for RAPD data and on the arithmetic complement of the weighted index for microsatellite data. The groups were formed according to the Tocher's cluster analysis and to the unweighted pair‑group method with arithmetic mean (UPGMA). The microsatellite markers were more efficient than the RAPD ones in the identification of genetic relationships. Information on the genetic distance, based on molecular characteristics and coupled with the cultivar agronomic performance,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Cluster analysis; Genetic divergence; Grapevine; Multivariate analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000900010

Genetic diversity of irrigated barley based on molecular and quantitative data and on malting quality
Provedor de dados: 86
Autores: Amabile,Renato Fernando; Faleiro,Fábio Gelape; Vieira,Eduardo Alano; Peixoto,José Ricardo; Capettini,Flávio; Ribeiro Júnior,Walter Quadros.
The objective of this work was to quantify the genetic diversity of elite genotypes of irrigated barley in the Brazilian savanna. Thirty elite barley genotypes from Embrapa Cerrados' collection were evaluated using 160 RAPD markers, 12 agronomic traits related to yield components, and 10 malting quality parameters. The genetic dissimilarity matrices based on molecular markers, quantitative traits, and malting quality characters were calculated and a cluster analysis was performed using the unweighted pair-group method with arithmetic mean (UPGMA) as grouping criterion. High genetic diversity among accessions were observed. The estimated genetic dissimilarities were weakly correlated, showing the complementarity of the different character groups. Selection...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hordeum vulgare; Breeding; Cerrado; Cluster analysis; Genetic resources; Selection indices.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000700007

Bayesian inference for the fitting of dry matter accumulation curves in garlic plants
Provedor de dados: 86
Autores: Macedo,Leandro Roberto de; Cecon,Paulo Roberto; Silva,Fabyano Fonseca e; Nascimento,Moysés; Puiatti,Guilherme Alves; Oliveira,Ana Carolina Ribeiro de; Puiatti,Mario.
Abstract: The objective of this work was to identify nonlinear regression models that best describe dry matter accumulation curves over time, in garlic (Allium sativum) accessions, using Bayesian and frequentist approaches. Multivariate cluster analyses were made to group similar accessions according to the estimates of the parameters with biological interpretation (β1 and β3). In order to verify if the obtained groups were equal, statistical tests were applied to assess the parameter equality of the representative curves of each group. Thirty garlic accessions were used, which are kept by the vegetable germplasm bank of Universidade Federal de Viçosa, Brazil. The logistic model was the one that fit best to data in both approaches. Parameter estimates of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium sativum; Cluster analysis; Multivariate clustering curves; Nonlinear models.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000800572

Estimates of genetic parameters and cluster analysis for worm resistance and resilience in Santa Inês meat sheep
Provedor de dados: 86
Autores: Oliveira,Elisa Junqueira; Savegnago,Rodrigo Pelicioni; Freitas,Luara Afonso de; Freitas,Anielly Paula; Maia,Suellen Rodrigues; Simili,Flávia Fernanda; Faro,Lenira El; Costa,Ricardo Lopes Dias da; Santana Júnior,Mário Luiz; Paz,Claudia Cristina Paro de.
Abstract: The objective of this work was to estimate genetic parameters for traits related to resistance to endoparasites in Santa Inês sheep, for a possible inclusion in sheep breeding programs, as well as to evaluate the additive genetic pattern of the animals using cluster analyzes, in order to assess whether there are groups within the population that can be used as candidates for selection for resistance to endoparasites. The studied traits were: Famacha score, fecal egg counts (FEC), packed cell volume (PCV), total plasma protein (TPP), body condition score (BCS), and body weight (BW). Heritability estimates ranged from 0.17 (0.05) for TPP to 0.31 (0.07) for BCS. The cluster analyzes based on the breeding values identified four clusters. Famacha and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Famacha; Genetic correlation; Heritability; K-means; Multivariate analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001201338

A cophenetic correlation coefficient for Tocher's method
Provedor de dados: 86
Autores: Silva,Anderson Rodrigo da; Dias,Carlos Tadeu dos Santos.
The objective of this work was to propose a way of using the Tocher's method of clustering to obtain a matrix similar to the cophenetic one obtained for hierarchical methods, which would allow the calculation of a cophenetic correlation. To illustrate the obtention of the proposed cophenetic matrix, we used two dissimilarity matrices - one obtained with the generalized squared Mahalanobis distance and the other with the Euclidean distance - between 17 garlic cultivars, based on six morphological characters. Basically, the proposal for obtaining the cophenetic matrix was to use the average distances within and between clusters, after performing the clustering. A function in R language was proposed to compute the cophenetic matrix for Tocher's method. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Optimization methods; Clustering consistency.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000600003

Finding out Relationships Among Some Morpho-Biochemical Parameters of Christ's Thorn (Ziziphus spina-christi) under Drought and Salinity Stresses
Provedor de dados: 87
Autores: NEJAT,N.; SADEGHI,H.
ABSTRACT Taking into consideration that modeling and indicating relationship among traits and variables are among the most useful numerical techniques in the biological and botanical researches, and also undeniable impact of drought and salinity stresses, this research was implemented with the aim to consider change in relationship among the traits under separately drought and salinity stresses related to scarcely distributed medicinal plant called Christ thorn (Ziziphus spina-christi). A glass house experiment was implemented in controlled conditions at the College of Agriculture, Shiraz University, Shiraz, Iran. Five different water stress levels (irrigation at four, six, eight and 10 days intervals, compared to the unstressed control plants with every...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salinity; Drought; Stepwise regressions; Principal component analysis; Cluster analysis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000400667

Conocimiento y aceptación de leche genéticamente modificada en consumidores de la Región del Maule, Chile
Provedor de dados: 31
Autores: Schnettler,   Berta; Sepulveda,   Oriana; Ruiz,   Danilo; Catalan,   Patricia; Sepulveda,   Nestor.
Published by Asociación de Economistas Agrarios de Chile
Tipo: Journal Article
Palavras-chave: Genetically modified foods; Conjoint analysis; Cluster analysis; Fluid milk.; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety.
Ano: 2008
URL: http://purl.umn.edu/97370

Host Country Attractiveness for CDM Non-Sink Projects
Provedor de dados: 31
Autores: Jung,   Martina.
In the present study, CDM host countries are classified according to their attractiveness for CDM non-sink projects. A cluster analysis is conducted based on three different factors determining host country attractiveness (mitigation potential, institutional CDM capacity and general investment climate) in order to elaborate a CDM host country classification. The results suggest that only a small proportion of potential host countries will attract most of the CDM investment. The CDM (non-sink) stars are China, India, Brazil, Argentina, Mexico, South Africa, Indonesia and Thailand. They are followed by attractive countries like Costa Rica, Trinidad and Tobago, Mongolia, Panama, and Chile. While most of the promising CDM host countries are located in Latin...
Tipo: Working or Discussion Paper
Palavras-chave: Clean development mechanism; Kyoto Protocol; Attractiveness; Cluster analysis; Farm Management; Q25; C49.
Ano: 2005
URL: http://purl.umn.edu/26328

Sequence analysis with Stata
Provedor de dados: 31
Autores: Brzinsky-Fay,   Christian; Kohler,   Ulrich; Luniak,   Magdalena.
We describe a general strategy to analyze sequence data and introduce SQ-Ados, a bundle of Stata programs implementing the proposed strategy. The programs include several tools for describing and visualizing sequences as well as a Mata library to perform optimal matching using the Needleman–Wunsch algorithm. With these programs Stata becomes the first statistical package to offer a complete set of tools for sequence analysis.
Tipo: Journal Article
Palavras-chave: Sqclusterdat; Sqclustermat; Sqdes; Sqindexplot; Sqom; Sqparcoord; Sqset; Sqstatlist; Sqstatsum; Sqstattab1; Sqstattab2; Sqstattabsum; Sqtab; Sequence analysis; Optimal matching; Cluster analysis; Panel data; Longitudinal data; Explorative data analysis; Sequence index plot; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/118169

AN EVALUATION OF CONSUMER SEGMENTS FOR FARMERS’ MARKET CONSUMERS IN INDIANA AND ILLINOIS
Provedor de dados: 31
Autores: Arrington,   Kendra; Dennis,   Jennifer H.; Mazzocco,   Michael A.
In Spring 2005 and Fall 2009 consumer surveys were collected in several Metropolitan 4 cities in Indiana and Illinois to explore differences based on psychographic and behavioral 5 characteristics of farmers’ market consumers. Consumer intercept surveys were conducted in: 6 South Bend, IN; Bloomington, IN; Springfield, IL and Peoria, IL. Likert scale questions were 7 analyzed using factor and hierarchical cluster analysis to identify clusters of consumers based on 8 several farmers’ market characteristics. Survey results show that of the 164 Metropolitan 9 surveys analyzed, 85.3% of respondents were Caucasian, 71.9% were between the ages of 35 and 10 64 and 78% were female. Data analysis showed that four clusters were formed: Recreational 11 (42%),...
Tipo: Conference Paper or Presentation
Palavras-chave: Cluster analysis; Consumers; Farmers’ market; Primary data; Surveys; Agribusiness.
Ano: 2010
URL: http://purl.umn.edu/93919

Ownership Form Effect on Large-Scale Farms' Performance: Case of Czech Agriculture
Provedor de dados: 31
Autores: Curtiss,   Jarmila; Medonos,   Tomas; Ratinger,   Tomas.
Replaced with revised version of paper 03/01/06.
Tipo: Conference Paper or Presentation
Palavras-chave: Cluster analysis; Czech agriculture; Ownership; Endogeneity; Large-scale farms; Performance; Principal component analysis.; Farm Management.
Ano: 2005
URL: http://purl.umn.edu/24435

Examination of the consumers’ ethnocentrism and products’ origin in the case of Hungarian foodstuffs
Provedor de dados: 31
Autores: Hamori,   Judit; Horvath,   Agnes; Lehota,   Jozsef.
‘Consumer ethnocentrism’ is defined as consumers’ beliefs about the appropriateness or morality of purchasing domestic and foreign-made products. As a consequence of the influx of foodstuffs of dubious origin into Hungary and the increasing number of food scandals, demand for Hungarian foodstuffs of reliable origin has increased. Consumers, however, do not necessarily acquire information from the most reliable sources in the course of purchasing and most of them are not fully aware of what the trademarks featured on the various products mean. Our questionnaire survey sought answers to the questions of how respondents regard Hungarian products and what segments can be distinguished from the aspect of their attitudes concerning Hungarian products. We...
Tipo: Journal Article
Palavras-chave: Consumer ethnocentrism; Hungarian food products; Trademarks; Questionnaire survey; Cluster analysis; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety; Marketing.
Ano: 2010
URL: http://purl.umn.edu/93121

Less Discussed Dynamics in the Czech Farm Structure Development
Provedor de dados: 31
Autores: Curtiss,   Jarmila; Ratinger,   Tomas; Medonos,   Tomas.
The paper provides an empirical study of the dynamics of ownership changes in Czech agricultural companies, which are assigned by unique heterogeneity in ownership forms. Since employee ownership has retained a relatively important place in these structures, neoclassical, as well as institutional theories of labour managed firms are considered. Building upon efficiency arguments, both approaches suggest the dissolution of labour managed firms. The empirical analysis utilized detailed survey data from 2004 and accountancy data from 1997 to 2003. We used cluster analysis to classify companies into homogeneous groups with respect to their ownership structure and stage of restructuring, and analysed these characteristics in relation to performance indicators....
Tipo: Conference Paper or Presentation
Palavras-chave: Cluster analysis; Czech agriculture; Ownership; Large-scale farms; Performance; Principal; Component analysis; Farm Management; D2; L1; L2.
Ano: 2006
URL: http://purl.umn.edu/25337

Impediments to Employment and Enterprise Diversification: Evidence from Small-Scale Farms in Poland
Provedor de dados: 31
Autores: Chaplin,   Hannah; Davidova,   Sophia; Gorton,   Matthew.
In an environment of low returns to agricultural activities and slow structural change, both employment and enterprise diversification have been presented as possible strategies for raising the incomes of farm households. This paper focuses on the barriers to taking up off-farm employment and establishing new non-agricultural enterprises. Factor and cluster analysis are applied to a data-set of individual farms in Poland in order to identify groups of households facing similar constraints and profile policy measures that are most likely to assist diversification. The majority of non-diversifiers are unlikely to become pluriactive in the near future due to a combination of age, a desire to concentrate on farming and remoteness. Farm households that are...
Tipo: Conference Paper or Presentation
Palavras-chave: Poland; Diversification; Off-farm employment; Non-agricultural enterprises; Cluster analysis; Industrial Organization; Labor and Human Capital; R0; Q12.
Ano: 2005
URL: http://purl.umn.edu/24760

Test of Convergence in Agricultural Factor Productivity: A Semiparametric Approach
Provedor de dados: 31
Autores: Paudel,   Krishna P.; Pandit,   Mahesh; Poudel,   Biswo N.
We tested for club convergence in U.S. agricultural total factory productivity using a sigma convergence test. We used the same club of states as used by McCunn and Huffman as well as different states within 10 clubs identified by the cluster analysis. Results showed convergence was evident only in a few club groups. Clusters group identified using a statistical method identified only converging clubs. Variables affecting total factor productivity among states were identified using parametric, semiparametric and nonparametric methods. Semiparametric and nonparametric methods gave a better fit than a parametric method as indicated by the specification test. Our results indicated that health care expenditure, public research and extension investment, and...
Tipo: Conference Paper or Presentation
Palavras-chave: Clubs; Sigma convergence; Cluster analysis; Semiparametric and nonparametric methods; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/104025

Sustainable development ability of grain production in Sichuan Province
Provedor de dados: 31
Autores: Guo,   Hong; Zou,   Yi-xing; Xiong,   Guang.
We set up the evaluation index system of the sustainable development ability of grain production on the basis of the overall analysis of grain production trend in Sichuan Province. And then we evaluate the sustainable development ability of grain production from 1990 to 2006 in Sichuan Province by adopting the method of principal component analysis. Result shows that the sustainable development ability of grain production has improved steadily, but there are some hidden troubles such as frequently changes of grain yield and gradually decrease of total farmland. Cluster analysis method is used to study on the sustainable development ability of grain production of 21 cities of Sichuan Province in the year 2006. result shows that grain production levels in...
Tipo: Thesis or Dissertation
Palavras-chave: Sichuan Province; Grain production; Sustainable development; Principal component analysis; Cluster analysis; China; Community/Rural/Urban Development; Land Economics/Use; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53481

Approaches for Selecting Product Innovation Projects in U.S. Food and Agribusiness Companies
Provedor de dados: 31
Autores: Roucan-Kane,   Maud; Gray,   Allan W.; Boehlje,   Michael.
www.ifama.org
Tipo: Journal Article
Palavras-chave: Food; Agribusiness; Innovation; Selection method; Portfolio; Functional area; Cluster analysis; Agribusiness; Agricultural Finance; Demand and Price Analysis; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/117599

FARMER-TRADER RELATIONSHIPS IN THE INDONESIAN CHILLI MARKETS: THE ROLE OF RELATIONSHIP QUALITY IN MODERN AND TRADITIONAL SUPPLY CHAINS
Provedor de dados: 31
Autores: Sahara; Gyau,   Amos; Stringer,   Randy; Umberger,   Wendy J.
A decade of strong economic growth, rapid urbanization and liberalization of foreign direct investment (FDI) are transforming Indonesia’s food retail sector. Modern retail markets are reorganizing how food chains operate: requiring product homogeneity, grading, sorting, packaging, and supply consistency. Current literature suggests that improving relationship quality among food chain actors enhances efficiency. In Indonesia, chillies are a priority crop commonly produced by small holders and like many other cash crops several farmer-trader issues emerging in chilli supply chains. This paper attempts to segment chilli farmers according to their perception of the relationship quality with their buyers. Data was collected through a survey of 602 chilli...
Tipo: Conference Paper or Presentation
Palavras-chave: Farmer-trader relationships; Relationship quality; Cluster analysis; Community/Rural/Urban Development.
Ano: 2011
URL: http://purl.umn.edu/100706

Small Business Marketing Capability in the Food Sector: The Cases of Belgium, Hungary and Italy
Provedor de dados: 31
Autores: Banterle,   Alessandro; Carraresi,   Laura; Stranieri,   Stefanella.
The purpose of this paper is to assess the marketing management capabilities of SMEs producing traditional food products in EU through the development of a self‐evaluation tool. SMEs represent the greater part of European food firms and they find it very difficult to adapt to market changes, and to compete with big enterprises. In this context, marketing management capabilities play a key role in good SME performance in the market. The self-evaluation tool is developed in the innovative form of an interactive questionnaire published on the web. At the moment, the sample is composed by 60 traditional food producers located in three member states (Belgium, Italy, and Hungary) belonging to different sectors (cheese, beer, dry ham, sausage and white pepper)....
Tipo: Journal Article
Palavras-chave: Marketing capabilities; Traditional food; SMEs; Cluster analysis; Food Consumption/Nutrition/Food Safety; Marketing; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/97226

Consumers' behaviours and attitudes toward healthy food products: The case of organic and functional foods
Provedor de dados: 31
Autores: Annunziata,   Azzurra; Pascale,   Paola.
Over the last decade consumers’ health consciousness is becoming an important factor driving the agrofood market. Healthier food products have entered the global markets with force in the past years and rapidly gained market share. Consequently, the food industry has reacted to this trend by developing a growing variety of new products with health-related claims and images, including organic and functional foods that are selected by consumers for their health-promoting properties. Currently, the healthy foods and drinks market is performing well, in terms of innovation and market penetration; healthy foods in Europe have a turnover of € 5.7 billion. Different researches conclude that a better understanding of consumers' perception of healthy foods and its...
Tipo: Conference Paper or Presentation
Palavras-chave: Functional foods; Organic products; Cluster analysis; Agricultural and Food Policy; Consumer/Household Economics.
Ano: 2009
URL: http://purl.umn.edu/57661

Livelihood strategies in the rural Kenyan highlands
Provedor de dados: 31
Autores: Brown,   Douglas R.; Stephens,   Emma C.; Ouma,   James Okuro; Murithi,   Festus M.; Barrett,   Christopher B.
The concept of a livelihood strategy has become central to development practice in recent years. Nonetheless, precise identification of livelihoods in quantitative data has remained methodologically elusive. This paper uses cluster analysis methods to operationalize the concept of livelihood strategies in household data and then uses the resulting strategy-specific income distributions to test whether the hypothesized outcome differences between livelihoods indeed exist. Using data from Kenya’s central and western highlands, we identify five distinct livelihood strategies that exhibit statistically significant differences in mean per capita incomes and stochastic dominance orderings that establish clear welfare rankings among livelihood strategies....
Tipo: Journal Article
Palavras-chave: Livelihood strategy; Kenya; Smallholder agriculture; Cluster analysis; Community/Rural/Urban Development.
Ano: 2006
URL: http://purl.umn.edu/57019

Analysing the Impact of Decoupling at a Regional Level in Ireland: A Farm Level Dynamic Linear Programming Approach
Provedor de dados: 31
Autores: Shrestha,   Shailesh; Hennessy,   Thia C.
This paper describes a methodology to assess the impact of the decoupling of payments on Irish farms at a regional level. The methodology is based on a farm level dynamic linear programming model which optimises regional gross margin under a set of constraints. Regionally representative farms are selected using cluster analysis. The model maximises aggregate gross margins from all the farm types in a region allowing land and milk quota to transfer between farms within the region. The model is estimated for a baseline scenario, assuming no policy change, and under a decoupled scenario where farm payments are fully decoupled from production. An example of an impact study at the Border region in Ireland is presented in this paper to demonstrate the methodology.
Tipo: Conference Paper or Presentation
Palavras-chave: Decoupling; Linear Programming; Cluster analysis; Agricultural policy; Regional level; Agricultural and Food Policy.
Ano: 2006
URL: http://purl.umn.edu/25458

Farmer Acceptance of Genetically Modified seeds in Germany: Results of a Cluster Analysis
Provedor de dados: 31
Autores: Gyau,   Amos; Voss,   Julian; Spiller,   Achim; Enneking,   Ulrich.
www.ifama.org
Tipo: Journal Article
Palavras-chave: Biotechnology; Cluster analysis; German farmers; Agricultural and Food Policy; Crop Production/Industries; Farm Management; Food Security and Poverty; Q2.
Ano: 2009
URL: http://purl.umn.edu/92552

Bestimmungsfaktoren für das Erwerbsverhalten von Landwirten unter besonderer Berücksichtigung der Unternehmereigenschaften
Provedor de dados: 31
Autores: Harsche,   Johannes.
This paper presents a Probit model explaining the expansion of part-time farming in the German State of Hesse. Particular emphasis is placed on the personality traits of the agricultural entrepreneur and the labour market. The regression is based on a cross-section data from 74 Hessian farms. The results suggest statistical significance of the personality traits on employment decisions. Other significant variables include the number of adult household members and the intensity of agricultural land use.
Tipo: Journal Article
Palavras-chave: Entrepreneur; Part-time farming; Labour economics; Probit analysis; Cluster analysis; Farm Management; Labor and Human Capital.
Ano: 2007
URL: http://purl.umn.edu/96738

Empirical Analysis on the Rural Urbanization Development in Luoyang City, China
Provedor de dados: 31
Autores: Guo,   You-rong.
Firstly, development status of rural urbanization in Luoyang City is introduced. A total of 6 indices are selected, such as total households in townships, total population in townships, total grain output, financial budget income, balance of savings deposits at the end of the year, and per capita net income of farmers. According to the data in 2009 Luoyang Statistical Yearbook, cluster analysis of 53 designated towns is carried out. Result shows that 53 designated towns are divided into 4 types according to the economic strength. Problems in the development of rural urbanization in Luoyang City are analyzed, such as imperfect management system, lack of effective economic measures, irrational town layout, unbalanced regional development, inadequate urban...
Tipo: Journal Article
Palavras-chave: Luoyang City; Rural urbanization; Cluster analysis; China; Agribusiness.
Ano: 2010
URL: http://purl.umn.edu/96045

Consumer Segments in Urban and Suburban Farmers Markets
Provedor de dados: 31
Autores: Elepu,   Gabriel; Mazzocco,   Michael A.
www.ifama.org
Tipo: Journal Article
Palavras-chave: Cluster analysis; Consumer segments; Farmers markets; Community/Rural/Urban Development; Consumer/Household Economics; Crop Production/Industries.
Ano: 2010
URL: http://purl.umn.edu/93352

IMPLICATIONS OF LAWN CARE AND LANDSCAPE MAINTENANCE FIRM PROFILES FOR ADOPTION OF PEST-MANAGEMENT PRACTICES
Provedor de dados: 31
Autores: Hubbell,   Bryan J.; Florkowski,   Wojciech J.; Oetting,   R.; Braman,   S.K.; Robacker,   C.D.
Firm characteristics and managers' attitudes and opinions about pesticide safety were used to classify lawn care and landscape management firms into four categories and compare them using the logit procedure.  Survey data obtained from 223 firms was used in the empirical investigation of the adoption of the IPM techniques.  Results showed the need for continued transfer of new technology to independently owned firms, multidisciplinary assessment of IPM methods before their transfer to ascertain the economic viability of proposed methods, public investment in programs training workers in knowledge-based pesticide applications, possible assistance in obtaining capital, and investment in consumer education.
Tipo: Journal Article
Palavras-chave: Attitudes; Cluster analysis; IPM; Logit model; Management; Survey; Agribusiness.
Ano: 2001
URL: http://purl.umn.edu/15286

Using Market Segmentation to Assess Consumers' Acceptance of Organic Eggs in Taiwan
Provedor de dados: 31
Autores: Huang,   Wan-Tran; Chien,   Chun-Yu.
The needs of the organic eggs are increasing; therefore, the farmers of chicken-egg (FCE) provide the best eggs to their consumers to satisfy their needs and wants.  Because the FCE cannot satisfy every consumer’ needs, FCE has to focus on some specific groups to satisfy their needs and wants.   This paper is to clarify the segmentation of the customers in middle Taiwan and build the empirical model via Cluster Analysis.  The 460 samples are taken randomly without some adjustment, but only 341 samples are used.  As the results, this paper gets the segmentations of product oriented, economic oriented, and production oriented, and which would be the target markets that the FCE should focus on.
Tipo: Conference Paper or Presentation
Palavras-chave: Organic eggs; Cluster analysis; Market segmentation; Product Position; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety.
Ano: 2006
URL: http://purl.umn.edu/7739

MULTIVARIATE PROCEDURES FOR IDENTIFYING RURAL LAND SUBMARKETS
Provedor de dados: 31
Autores: Kennedy,   Gary A.; Henning,   Steven A.; Vandeveer,   Lonnie R.; Dai,   Ming.
Research has developed empirical models and procedures for analyzing factors which influence rural land markets; however, there have been limited efforts in developing procedures for identifying rural land submarkets.  Principal component analysis is used here to detect the presence of multiple rural land submarkets. Cluster analysis is then used as a basis for identifying eight contiguous rural land submarkets in Louisiana. As opposed to single-attribute procedures that have been based largely on subjective judgment, multivariate procedures illustrated in this analysis provide a means for capturing the combined effects of physical and socioeconomic influences in delineating rural land submarkets.
Tipo: Journal Article
Palavras-chave: Cluster analysis; Land market analysis; Principal component analysis; Rural land submarkets; Land Economics/Use.
Ano: 1997
URL: http://purl.umn.edu/15066

ESTILOS GERENCIAIS E OBJETIVOS DE AGRICULTORES DA REGIÃO NORTE DO ESTADO DO ESPÍRITO SANTO
Provedor de dados: 31
Autores: Teixeira,   Marcelo Brandao; Vale,   Sonia Maria Leite Ribeiro do.
This work identified the management aspects of the decision making process of farmers in the Northern Region of Espirito Santo, Brazil, in 2006. Using a psychological approach, this study showed its importance in understanding farm management. The management styles and personal characteristics of the farmers and their farms were identified. The main areas of interest in management capacity improvement were also defined. This study found that family welfare is the main concern of decision makers in the Northern region of Espirito Santo, Brazil. Regarding management styles, four main styles were identified. Most of the farmers were interested in improving their management capacity through managerial training, especially the younger ones, preferably in...
Tipo: Journal Article
Palavras-chave: Management styles; Cluster analysis; Objectives; Agribusiness; Agricultural Finance.
Ano: 2008
URL: http://purl.umn.edu/60707

An Innovative Tool to Assess Marketing Capabilities of Traditional Producers within the European Food Industry
Provedor de dados: 31
Autores: Banterle,   Alessandro; Carraresi,   Laura; Stranieri,   Stefanella.
The purpose of this paper is to assess the marketing management capabilities of SMEs producing traditional food products in EU throughout the development of a benchmarking tool. SMEs represent the greater part of European food firms and they find it very difficult to adapt to market changes, and to compete with big enterprises. In this context, marketing management plays a key role in good SMEs performances in the market. The benchmarking tool, utilised to assess marketing capabilities, is aimed at improving critical points in the marketing area of traditional food firms by following the example of the best ones. This method is developed in the innovative form of an interactive questionnaire published on the Web. At the moment the sample is composed by 60...
Tipo: Conference Paper or Presentation
Palavras-chave: Marketing capabilities; Traditional food; Benchmarking; Cluster analysis; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Industrial Organization; L25; L66; M31; Q13.
Ano: 2008
URL: http://purl.umn.edu/49769

Assessing Food Safety Concepts on the Dairy Farm: The Case of Chemical Hazards
Provedor de dados: 31
Autores: Valeeva,   Natasha I.; Meuwissen,   Miranda P.M.; Oude Lansink,   Alfons G.J.M.; Bergevoet,   Ron H.M.; Huirne,   Ruud B.M.
Adaptive conjoint analysis was used to elicit farmers' and experts' preferences for attributes of improving food safety with respect to chemical hazards on the dairy farm. Groups of respondents were determined by cluster analysis based on similar farmers' and experts' perceptions of food safety improvement.  Results show differences in priority of the more important attributes. However, respondents in all groups valued "identification of treated cows" as one of the most important attributes. The results provide the processing industry and extension service with a better understanding of aspects that may form farmers' perceptions of improving food safety, and thus help to define the message for targeting different farmer groups.
Tipo: Conference Paper or Presentation
Palavras-chave: Food safety; Dairy farm; Conjoint analysis; Cluster analysis; Food Consumption/Nutrition/Food Safety.
Ano: 2004
URL: http://purl.umn.edu/24979

A GABONAPIACI KERESLET SZEREPLŐINEK ÁTALAKULÁSA
Provedor de dados: 31
Autores: Kemenyne Horvath,   Zsuzsanna.
A tanulmány bemutatja a hazai gabona keresletében bekövetkezett vertikális és horizontális átrendeződést és annak hatásait. A kérdőíves megkeresés és a mélyinterjúkból született válaszokat felhasználva, klaszteranalízis segítségével lehetővé vált a felvásárlói oldalon álló szereplők tipizálása, továbbá az áralku döntéseik modellezése. Megállapítható, hogy a gabonapiacon elsősorban a nagy kereskedelmi cégek és holdingok az árvezetők, ami méretükkel, tároló kapacitá-saikkal, logisztikai adottságaikkal és stratégiájukkal magyarázható. A feldolgo-zók (malom, takarmánykeverő, vetőmagos cégek), az integrátorok, kiskereskedők és egyéb cégek árelfogadók a gabonapiacon. Az intervenciós árszint a keresleti oldalon álló szereplők áralkuit, gabonapiaci stratégiáját...
Tipo: Journal Article
Palavras-chave: Gabonapiac; Intervenció; Klaszteranalízis; Keresleti oldal; Áralku; Grain market; Intervention; Cluster analysis; Demand side; Price deal; Agribusiness; Crop Production/Industries; International Relations/Trade; Production Economics.
Ano: 2007
URL: http://purl.umn.edu/57664

Efecto de la intensificacion sobre la eficiencia de las explotaciones lecheras
Provedor de dados: 31
Autores: Alvarez,   Antonio; del Corral,   Julio; Perez,   Jose Antonio; Solis,   Daniel.
This study analyzes the differences on production cost associated with the intensification of production for a sample of dairy farms in Asturias. In doing so, we account for two methodological issues which are not usually considered in the empirical literature. On the one hand, we allow for different technologies within the sample. On the other hand, we estimate ex ante cost functions, which use "planned output" instead of the traditional ex post approach which uses the "observed output". Our results show a positive relation between intensification and efficiency.    RESUMEN Este trabajo analiza las diferencias en costes de producción asociados con la intensificación productiva de explotaciones lecheras en Asturias. Para lograr este objetivo se han...
Tipo: Journal Article
Palavras-chave: Cluster analysis; Efficiency; Ex ante cost function; Intensification; Livestock Production/Industries; Q12; C23.
Ano: 2007
URL: http://purl.umn.edu/7996

Consumer Preferences for Fresh Citrus: Impacts of Demographic and Behavioral Characteristics
Provedor de dados: 31
Autores: Gao,   Zhifeng; House,   Lisa; Gmitter,   Fred G., Jr.; Valim,   M. Filomena; Plotto,   Anne; Baldwin,   Elizabeth A.
www.ifama.org
Tipo: Journal Article
Palavras-chave: Fresh citrus; Consumer preference; Attitude; Cluster analysis; Market segmentation; Consumer/Household Economics; Crop Production/Industries; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Marketing; Q13.
Ano: 2011
URL: http://purl.umn.edu/100769

The application of multivariate statistical methods for understanding food consumer behaviour
Provedor de dados: 31
Autores: Lakner,   Zoltan; Hajdu,   Istvanne; Banati,   Diana; Szabo,   Erzsebet; Kasza,   Gyula.
Understanding consumer behaviour is a necessary precondition for a targeted communication strategy. The behaviour is a complex phenomenon and research needs to undertake a rigorously apply sophisticated methods. This article entails the combined utilisation of categorical principal component analysis and cluster analysis to determine the major, relatively homogenous consumer groups and this is coupled with confirmatory factor analysis and structural model building to understand consumer behaviour, based on Fishbein and Ajzent’s theoretic model.
Tipo: Journal Article
Palavras-chave: Categorical principal component analysis; Cluster analysis; Confirmatory factor analysis; Consumers’ segmentation; Structural model building; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/107651

Internal preference mapping of cured ham with consumer's segmentation in Spain
Provedor de dados: 31
Autores: Resano,   H.; Sanjuan,   Ana Isabel.
The overall acceptability of 202 consumers has been analysed by ANOVA, multiple means comparison, cluster analysis and internal preference mapping (MDPREF). Three clusters are found with different preference criteria. These clusters can also be characterized according to actual purchase behaviour, declared consumption habits and sociodemographic characteristics. This study demonstrates the importance for the agro-food industry of examining consumers’ individual preferences as well as average ones, to obtain relevant information including not only the consumers’ preference trends, but also the most suitable segment to target a new product. In this way, the MDPREF shows that although consumers’ preferences tend to Iberian hams over white-breed hams, there is...
Tipo: Conference Paper or Presentation
Palavras-chave: Internal preference mapping; Acceptability; Cluster analysis; Demand and Price Analysis.
Ano: 2008
URL: http://purl.umn.edu/44402

SOCIO-ECONOMIC STATUS AND THE STRUCTURAL CHANGE OF DIETARY INTAKE IN HUNGARY: A PANNEL STUDY
Provedor de dados: 31
Autores: Bakucs,   Lajos Zoltan; Ferto,   Imre; Marreiros,   Cristina.
Typically, big changes in the economic system lead to alterations on the disposable income of families and thus on their spending for different type of products, including food. These may imply, in the long run, a structural modification of the quality of diet of the population. After the fall of the socialist system, in the past two decades Central and Eastern European countries, including Hungary, went through a profound, and sometimes difficult transition of their political and economic systems, shifting from a centralized planned economy to an open market economy, and more importantly, the European Union integration. Economic change in lower-income and transitional economies of the world appears to coincide with increasing rapid social change. With...
Tipo: Conference Paper or Presentation
Palavras-chave: Transition economy; Food consumption patterns; Cluster analysis; Logit analysis; Agricultural and Food Policy; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/116402

A Mixed Geographically Weighted Approach to Decoupling and Rural Development in the EU-15
Provedor de dados: 31
Autores: Pecci,   Francesco; Sassi,   Maria.
The CAP reform and the recent EC communication aimed at preparing its Health Check emphasise the need for interventions locally based where agricultural policy integrates with a broader policy for rural areas growth. In this context, the paper investigates the possible different sets policy indicators affecting agricultural productivity at the regional level considering spatial heterogeneity by means of a Mixed Geographically Weighted Regression approach. The analysis is based on a set of policy sensitive indicators selected according to the key component of the CAP reform and referred to a sample of 164 EU-15 regions at NUTS2 level. The methodology adopted, new for the empirical literature on the topic, allows for a more accurate understanding of spatial...
Tipo: Conference Paper or Presentation
Palavras-chave: CAP reform; Agricultural productivity; Spatial analysis; Cluster analysis; Agricultural and Food Policy; Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6625

Examination of the value system and food preferences in the institutional catering market in light of primary research carried out in Békés county
Provedor de dados: 31
Autores: Fodor,   Monika.
In my present paper I try to characterise the differences present at the level of food preferences by means of examining the value system as, in my opinion, differences in the value system are reflected in concrete product choices and thus also in food selection. By using factor and cluster analysis I have proven that consumer groups formed alongside the value system also differ regarding food consumption viewpoints. Furthermore, in my paper I also aim to characterise food preference as a determining factor of modes of daily eating. Based on the results, I have concluded that the impact of time-related preferences on food selection can be felt in consumers’ opinions, but cannot be regarded as dominant. In the system of food selection viewpoints, internal...
Tipo: Journal Article
Palavras-chave: Food consumption preferences; Value system; Factor analysis; Cluster analysis; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/48095

Comparative Research on the Rural Development Levels of 31 Provinces and Regions in China
Provedor de dados: 31
Autores: Xia,   Zheng.
According to the 2010 China Statistical Yearbook, a total of 12 indicators in the aspects of residents’ production, consumption expenditure, and living conditions are selected in order to construct the indicator system of rural development level. Both factor analysis and cluster analysis methods are adopted to compare the current situations of rural development levels in 31 provinces and regions of China. Result of factor analysis shows that the 12 indicators can be classified into 4 factors, such as the income and expenditure factor, the agricultural scale and science and technology factor, the life quality factor, and the agricultural output factor. Moreover, factors affecting the rural development level of China are analyzed. Then, the 31 provinces and...
Tipo: Journal Article
Palavras-chave: Rural development level; Factor analysis; Cluster analysis; China; Agribusiness.
Ano: 2011
URL: http://purl.umn.edu/113416

Ethanol Plant Location Determinants and County Comparative Advantage
Provedor de dados: 31
Autores: Lambert,   Dayton M.; Wilcox,   Michael D.; English,   Alicia; Stewart,   Lance A.
The location of ethanol plants is determined by infrastructure, product and input markets, fiscal attributes of local communities, and state and federal incentives. This empirical analysis uses probit regression along with spatial clustering methods to analyze investment activity of ethanol plants at the county level for the lower U.S. 48 states from 2000 to 2007. The availability of feedstock dominates the site selection decision. Other factors, such as access to navigable rivers or railroads, product markets, producer credit and excise tax exemptions, and methyl tertiary-butyl ether bans provided some counties with a comparative advantage in attracting ethanol plants.
Tipo: Journal Article
Palavras-chave: Cluster analysis; Comparative advantage; Ethanol production; Location model; Community/Rural/Urban Development; Environmental Economics and Policy; Political Economy; R1; R3.
Ano: 2008
URL: http://purl.umn.edu/45511

Agricultural Input Market Segments: Who Is Buying What?
Provedor de dados: 31
Autores: Alexander,   Corinne E.; Wilson,   Christine A.; Foley,   Daniel H.
For agribusiness managers and salespeople, understanding customers and their preferences and behaviors is crucial to success. This study uses cluster analysis to identify five distinct buyer segments for expendable input purchases for U.S. crop and livestock commercial producers. A multinomial logit model is used to predict segment membership based on demographic, behavioral, and business management factors. Results provide important information for agricultural input suppliers.
Tipo: Journal Article
Palavras-chave: Cluster analysis; Input suppliers; Market segmentation; Multinomial logit; Marketing; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/59673

Coupon, Bogof, Linksave oder Rabatt? Akzeptanz neuer Verkaufsförderungsaktionen des Lebensmitteleinzelhandels
Provedor de dados: 31
Autores: Moeser,   Anke.
Im deutschen Lebensmitteleinzelhandel finden sich neben dem bekannten Sonderangebot vermehrt neue Aktionsformen wie „BOGOF“, „Rabatt“, „Linksave“ oder „Coupons“. Der vorliegende Beitrag diskutiert die Akzeptanz dieser unterschiedlichen Verkaufsförderungs-aktionen. Dabei ist davon auszugehen, dass Verbraucher zwischen dem Nutzen einer Aktion und dem Aufwand bei der Wahrnehmung der Aktion abwägen. Im Rahmen einer Verbraucherbefragung zeigt sich eine deutliche Verbraucherpräferenz für das bekannte Sonderangebot, während aufwändigere Aktionsformen wie der Coupon eher abgelehnt werden. Daneben sind Opportunitätskosten der Zeit und Einkaufsfähigkeiten der Verbraucher wichtige Einflussfaktoren auf die Nutzung einer Aktion.  Sales promotions like price actions,...
Tipo: Conference Paper or Presentation
Palavras-chave: Verkaufsförderungsaktionen; Lebensmitteleinzelhandel; Multinomiale Logitanalyse; Cluster-analyse; Sales promotions; Retailing sector; Multinomial logit analysis; Cluster analysis; Marketing.
Ano: 2011
URL: http://purl.umn.edu/114499

Cluster Analysis on Per Capita Net Income of Rural Households in China
Provedor de dados: 31
Autores: Guan,   Linlin; Men,   Ke-pei.
We summarize the status of rural areas in China, and introduce the principle of Cluster Analysis. According to related statistical data, per capita net income of rural households in various regions of China is analyzed by adopting the method of Cluster Analysis. The results showed that 31 cities, autonomous regions and provinces in China can be divided into 4 types. The first type includes Beijing and Shanghai. Comprehensive economic strengths of these regions, as well as per capita net income of rural households, are in the forefront. The second type includes Tianjin, Jiangsu and Zhejiang Provinces of China, which have superior conditions of agricultural production with excellent foundation of agriculture and stable income sources. The third type includes...
Tipo: Thesis or Dissertation
Palavras-chave: Rural household; Per capita net income; Cluster analysis; China; Community/Rural/Urban Development; Financial Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53757

Institutional and governance factors influencing the performance of selected smallholder agricultural cooperatives in KwaZulu-Natal
Provedor de dados: 31
Autores: Chibanda,   M.; Ortmann,   Gerald F.; Lyne,   Michael C.
This paper evaluates the impact of institutional and governance factors on the performance of 10 smallholder agricultural cooperatives in KwaZulu-Natal (KZN). Five of the cooperatives grow and market vegetables, three produce and market poultry, one is a beef production cooperative and another operates a bakery. The results of a cluster analysis suggest that the performance of the selected smallholder cooperatives is influenced by institutional and governance problems. Institutional problems give rise to low levels of equity and debt capital, reliance on government funding, low levels of investment, and subsequent loss of members. Governance problems are strongly linked to the absence of secret ballot, low levels of education, lack of production and...
Tipo: Journal Article
Palavras-chave: Traditional cooperatives; Performance; Institutions; Good governance; Cluster analysis; Institutional and Behavioral Economics.
Ano: 2009
URL: http://purl.umn.edu/55132

Identificación de potenciales consumidores y clientes de pequeñas empresas agropecuarias, en una feria especialidades campesinas de Chile
Provedor de dados: 31
Autores: Caceres,   Leonardo; Torres,   Victoria; Saez,   Luis.
Published by Asociación de Economistas Agrarios de Chile
Tipo: Journal Article
Palavras-chave: CATPCA; Cluster analysis; Typical food; Market segmentation.; Agribusiness; Consumer/Household Economics.
Ano: 2009
URL: http://purl.umn.edu/97377

Salvadoran Consumption of Ethnic Foods in the United States
Provedor de dados: 31
Autores: Batres-Marquez,   S. Patricia; Jensen,   Helen H.; Brester,   Gary W.
The U.S. Salvadoran population is the largest group of Central and South American people living in the United States today. This study investigates the U.S. food market for thirty Salvadoran foods and the demographic characteristics and attitudes of Salvadorans toward these foods, based on data obtained from a survey conducted among Salvadoran people in Los Angeles, California, and Houston, Texas. Those surveyed were predominantly low income, without a high school degree, and living in large families. The Salvadoran foods consumed most were tortilla flour, red beans, loroco, semita, queso duro, and horchata. Four different groups of households were determined by using cluster analysis. The results indicate that products from El Salvador with the greatest...
Tipo: Working or Discussion Paper
Palavras-chave: Cluster analysis; Ethnic food demand; Hispanic population; Food Consumption/Nutrition/Food Safety.
Ano: 2001
URL: http://purl.umn.edu/18635

Revenue and Cost Functions in PMP: a Methodological Integration for a Territorial Analysis of CAP
Provedor de dados: 31
Autores: Arfini,   Filippo; Donati,   Michele; Grossi,   L.; Paris,   Quirino.
An integrated policy evaluation tool is proposed for assessing the effects of agricultural policy measures using all the information available at farm level. The tool combines the positive mathematical programming methodology with the cluster analysis technique by using the same panel of data. The PMP model proposed here allows to measure the effects of policy in term of agricultural supply responses including output market price variations. The novel procedure by which the PMP model is articulated permits to recover the set of farm level demand functions for agricultural products and the cost function characterizing the given sample of farms. Cluster analysis is useful for better appreciating the behaviour of farms before and after the policy scenario...
Tipo: Conference Paper or Presentation
Palavras-chave: Positive mathematical programming; Cluster analysis; Integrated tool; Agricultural policies; Policy evaluation; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6636

Variations in Farm Performance: Evidence from the CEECs and Existing EU Member States
Provedor de dados: 31
Autores: Davidova,   Sophia; Gorton,   Matthew; Ratinger,   Tomas; Zawalinska,   Katarzyna; Iraizoz,   Belen; Kovacs,   Barna; Mizo,   Tamas.
This paper attempts to shed light on the recent performance of farms in the Czech Republic, Hungary and Poland and to compare the findings from the CEECs with the EU situation. Utilising farm survey data, ratios of agricultural profitability and productivity have been estimated and clusters of farms with similar characteristics have been identified. Analysis indicates that the Hungarian farms have the best prospects amongst the analysed accession countries according to their profitability. The poor profitability and structural problems of Polish agriculture are highlighted. The family farms are less productive than corporate farms in the Czech Republic and Hungary despite the expectations at the outset of the reform that better incentives will boost their...
Tipo: Conference Paper or Presentation
Palavras-chave: CEECs; Farm performance; Profitability; Cluster analysis; Agribusiness.
Ano: 2002
URL: http://purl.umn.edu/24906

Evaluation on Development Level of Rural Circular Economy in Hebei Province, China
Provedor de dados: 31
Autores: Guo,   Ping; Sun,   Wen-sheng.
According to availability of rural data, and the actual situation of economic development in different areas, 1 first grade index, 2 grade indices and 20 third grade indices are selected to establish the measurement index system of circular economic development level in rural areas. According to the relevant data, standardized processing of data is conducted. Evaluation on circular economic level in Hebei Province by Factor Analysis indicates that comprehensive score of Shijiazhuang, Qinghuangdao and Tangshan Cities is the highest, that of Xingtai, Handan, Langfang, Baoding, Cangzhou Cities is at a medium level, and that of Hengshui, Chengde and Zhangjiakou is the lowest. Meanwhile, cluster analysis on data after standardization shows that Handan, Baoding,...
Tipo: Journal Article
Palavras-chave: Rural circular economy; Factor analysis; Cluster analysis; China; Agribusiness.
Ano: 2009
URL: http://purl.umn.edu/93450

A NORTHEAST BORROWER TRAINING PROGRAM: EVOLUTION AND IMPACTS
Provedor de dados: 31
Autores: Parsons,   Robert L.; Hanson,   Gregory D.
A financial training program designed by Cooperative Extension specialists was provided to over 2,000 USDA/FSA borrowers from the Northeast during the period 1994-1999.  Key to the success of the workshops was an in-depth, user-friendly curriculum that evolved over time, eventually replacing satellite-feed instruction with pre-taped videos.  Cluster analysis classified nearly 70 percent of workshop participants as "Low Finance Priority" or "Low Finance Knowledge."  Farmers in these clusters received a relatively greater educational benefit from the program than those not in these clusters..   Impact analysis indicated that perceived annual gain in farm net worth from application of workshop tools ranged from approximately $5,000 to $10,000.  The training...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural finance; Workshop methods; Borrower training; Cluster analysis; Impact analysis; Agricultural Finance; Teaching/Communication/Extension/Profession.
Ano: 2000
URL: http://purl.umn.edu/21843

Non-Tariff Measures in Agri-Food Trade: What Does the Data Tell Us? Evidence from a Cluster Analysis on OECD Imports
Provedor de dados: 31
Autores: Disdier,   Anne-Celia; van Tongeren,   Frank W.
Non-tariff measures (NTMs) are playing an increasing role in international trade of agri-food trade. Although well-recognized, this aspect has not been extensively analysed at a disaggregated product level. This paper presents a quantitative analysis of the trade incidence of NTMs notified by OECD countries on 777 products and clusters these products according to three trade indicators.  While the ‘protection for sale’ literature provides useful explanations, it is not completely satisfying in resolving the puzzle of cross-product differences in the occurrence of NTMs.
Tipo: Conference Paper or Presentation
Palavras-chave: Non-tariffs measures; Cluster analysis; Political economy of protection; Agricultural and Food Policy; International Relations/Trade; Political Economy; C83; P16; Q17.
Ano: 2009
URL: http://purl.umn.edu/51759

Perceptions of PDO Beef: The Portuguese Consumer
Provedor de dados: 31
Autores: Marreiros,   Cristina; Ness,   Mitchell.
The objectives of this paper are to examine consumers' perceptions of Protected Designation of Origin (PDO) beef on the basis of a survey of consumers and buyers of beef. The paper identifies a profile of PDO beef consumers, examines their behaviour and perceptions on PDO beef, derives the dimensions of perceptions of PDO beef, and establishes segments based upon those dimensions. The results reveal that PDO consumers are representative of all geographical regions, age and profession groups, are lighter consumers of beef and shop for food mainly in the butchers. Consumers' perceptions on PDO beef emphasises quality, safety, and control. However, underlying those perceptions are six main dimensions and it is possible to identify three segments of PDO beef...
Tipo: Conference Paper or Presentation
Palavras-chave: Protected designations of origin; Beef; Perceptions; Factor analysis; Cluster analysis; Consumer/Household Economics.
Ano: 2002
URL: http://purl.umn.edu/24869

Ranking and Clustering of the Economic Status of Rural Residents in 31 Provinces and Regions in China
Provedor de dados: 31
Autores: Tang,   Jun.
In order to rank and cluster the economic status of rural residents in 31 provinces, cities and autonomous regions, the MATLAB software is used and the component analysis and the cluster analysis are conducted on the data reflecting the economic status of each area. The results show that the provinces or cities with high comprehensive , scores are Shanghai Municipality, Beijing Municipality, Zhejiang Province, Jiangsu Province, Tianjin Municipality, Guangdong Province, Fujian Province, Shandong Province and Liaoning Province according to priority; the provinces or autonomous regions with low comprehensive scores are Gansu Province, Guizhou Province , Tibet, Uygur autonomous region and Yunnan Province. The economic status of rural residents in the 31...
Tipo: Journal Article
Palavras-chave: Economic status of rural residents; Principal component analysis; Cluster analysis; Economic development; China; Agribusiness.
Ano: 2010
URL: http://purl.umn.edu/102388

A munkahelyi étkezés hazai fogyasztói piacának vizsgálata
Provedor de dados: 31
Autores: Fodor,   Monika; Gyenge,   Balazs; Horvath,   Agnes.
Tanulmányunkban 1000 fős országos felmérés eredményei alapján azonosítottuk a hazai munkahelyi étkezés fogyasztói szegmenseit. Bebizonyítottuk, hogy a célcsoportok szocio-demográfiai ismérvek mellett az étkezési és élelmezési szokások, a munkahelyi étkezéshez való viszony szerint is eltéréseket mutatnak, amely igazolja, hogy ezen ismérvek befolyásolják az egyént abban, hogy milyen munkahelyi étkezési formát választ. Megállapítható, hogy a munkahelyi étkezés igénybevétele leginkább az időtudatos élelmiszer-fogyasztói magatartással függ össze, de megjelennek a kényelem, a termékminőség és a kiegészítő szolgáltatások iránti fogyasztói elvárások is. Az eredmények segítséget jelenthetnek a piacfejlesztési, piacbővítési lehetőségek definiálásában és a célpiaci...
Tipo: Article
Palavras-chave: Munkahelyi étkezés; Faktoranalízis; Klaszteranalízis; Institutional catering; Factor analysis; Cluster analysis; Consumer/Household Economics; Marketing.
Ano: 2011
URL: http://purl.umn.edu/119924

Subsistence and Semi-subsistence Farming in Selected EU New Member States
Provedor de dados: 31
Autores: Davidova,   Sophia; Fredriksson,   Lena; Bailey,   Alastair.
Factor and cluster analysis are used to analyse the attitudes and perceptions of agricultural households in five EU New Member States towards farming, commercialisation, and barriers to and drivers for an increased integration in agricultural markets. The contribution of unsold output to the total household income is valued. A stepwise linear regression is employed to detect important variables explaining the degree of agricultural market integration of farm households. The analysis indicates that subsistence farming is of utmost importance for the rural poor, and particularly in Bulgaria and Romania. The proportion of consumption from own production, manual cultivation techniques and distance to an urban centre negatively affect output sales. Rural...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural households; Subsistence; Commercialisation; Incomes; Cluster analysis; Stepwise regression; Community/Rural/Urban Development; Consumer/Household Economics; Crop Production/Industries; Q12.
Ano: 2009
URL: http://purl.umn.edu/52801

The resilient character of PDO/PGI products in dynamic food markets
Provedor de dados: 31
Autores: Arfini,   Filippo; Capelli,   Maria Giacinta.
The European and Italian food system is experiencing a change in the relationship with the consumer and with the distribution. In fact, customers are increasingly demanding, and are attracted, by products that have high quality content and a strong link with the territory. The brands with the price are the two factors affecting the strategic policies of the food producer firms. At the same time, the retail system has proven to be very sensitive to consumer demands by providing quality products at competitive prices and using their brand as an element of loyalty. In the European context, the Italian agri-food system has the higher number of products with the Protected Designation of Origin (PDO) and Protected Geographical Indication (PGI) recognition....
Tipo: Conference Paper or Presentation
Palavras-chave: PDO/PGI; Quality; Modern distribution; Cluster analysis; Marketing strategies; Development processes; Agricultural and Food Policy; Marketing.
Ano: 2009
URL: http://purl.umn.edu/57670

Multi-variable analyses of marketing by wine producers
Provedor de dados: 31
Autores: Doman,   Szilvia.
Tipo: Journal Article
Palavras-chave: Wine distribution; Sales problems; Cluster analysis; Plant size; Agribusiness; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/48089

FOOD SECURITY AND TRADE NEGOTIATIONS IN THE WORLD TRADE ORGANIZATION: A CLUSTER ANALYSIS OF COUNTRY GROUPS
Provedor de dados: 31
Autores: Diaz-Bonilla,   Eugenio; Thomas,   Marcelle; Robinson,   Sherman; Cattaneo,   Andrea.
An important issue in WTO trade negotiations is whether further liberalization of trade and agricultural policies may help or hinder food security in WTO member countries, especially the developing countries. The WTO recognizes various classifications of countries: developed, developing, least developed (LDC) and net food importing developing (NFIDC). How well do these categories capture issues of food security? This paper employs various methods of cluster analysis (including an approach based on fuzzy sets) and data for 167 countries to identify groups of countries categorized according to five measures of food security: food production per capita, the ratio of total exports to food imports, calories per capita, protein per capita, and the share of the...
Tipo: Working or Discussion Paper
Palavras-chave: Food security; WTO; Cluster analysis; Fuzzy classification; Food Security and Poverty; International Relations/Trade.
Ano: 2000
URL: http://purl.umn.edu/16261

The Demand for Meats in Indonesia: A Censored Regression Approach
Provedor de dados: 31
Autores: Hutasuhut,   Maradoli; O'Donnell,   Christopher J.; Chang,   Hui-Shung (Christie); Griffith,   Garry R.; Doran,   Howard E.
In this study, meat consumption and socio-demographic data from the 1990, 1993 and 1996 SUSENAS Household Food Expenditure and Consumption Surveys were employed to estimate the demand for meats in Indonesia. The provinces of DKI Jakarta and West Java were chosen as the areas of study because of the population, level of meat consumption and the availability and quality of information in these two provinces. Several statistical and econometric procedures were performed. Firstly, a cluster analysis (Nicol, 1991) was used to aggregate the 16 meat types recorded in the SUSENAS into four Meat Groups (MG-1, 2, 3 and 4). Secondly, a double truncation procedure was used to estimate the linear approximation of the Almost Ideal Demand System (LA/AIDS) because of the...
Tipo: Presentation
Palavras-chave: Censoring; Cluster analysis; Cross-sectional data; Linearised AIDS.; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety.
Ano: 2000
URL: http://purl.umn.edu/123666

TYPOLOGY OF RURAL AREAS IN THE CENTRAL AND EASTERN EUROPEAN EU NEW MEMBER STATES
Provedor de dados: 31
Autores: Baum,   Sabine; Trapp,   Christian; Weingarten,   Peter.
Rural areas in Central and Eastern Europe are very often associated with a backwardness in terms of income and employment opportunities, a high dependency on agriculture, the out-migration of young, skilled people, a low population density and an insufficient infrastructure. In this paper 3 typologies are presented, which show that rural areas cannot be considered homogeneous and not all of them need the same developmental measures. The first typology classified all NUTS-3 regions in the ten Central and Eastern European countries (CEEC-10) by means of cluster analysis according to 7 demographic and socio-economic criteria. The result revealed 5 different types of regions as most adequate: three are largely rural, one includes both rural, and especially...
Tipo: Working or Discussion Paper
Palavras-chave: Rural area; Typology; Central and Eastern Europe; Cluster analysis; Community/Rural/Urban Development; C19; P25; R12.
Ano: 2004
URL: http://purl.umn.edu/14906

PRODUCER SEGMENTATION AND THE ROLE OF LONG-TERM RELATIONSHIP IN MALAYSIA’S MILK SUPPLY CHAINS
Provedor de dados: 31
Autores: Boniface,   Bonaventure.
Research on buyer-seller relationships in the agricultural sector receives little attention. A growing body of evidence suggests that strong buyer-seller relationships facilitate more efficient supply chains. The long term relationship literature tends to treat suppliers as a homogenous group when attempting to identify motivations, strategies and incentives to enhance the quality of buyer-seller relationships. This article explores the role of long-term relationships between buyers and sellers in Malaysia’s dairy industry, taking into consideration the heterogeneous nature of the producers. Interviews with 133 producers provide the data for this study. Cluster analysis suggests two well-defined groups differing in terms of demographic characteristics and...
Tipo: Conference Paper or Presentation
Palavras-chave: Buyer-seller relationship; Price satisfaction dimensions; Cluster analysis; Dairy industry; Malaysia; Marketing.
Ano: 2011
URL: http://purl.umn.edu/100532

Genetic Diversity and Phyletic Evolution of Eleven Chinese Indigenous and Three Commercial Chicken Breeds by mtDNA Sequences
Provedor de dados: 89
Autores: Yu,C; Qiu,M; Jiang,X; Zhang,Z; Du,H; Li,Q; Xia,B; Song,X; Hu,C; Xiong,X; Yang,L; Peng,H; Chen,J; Wang,Y; Yang,C.
ABSTRACT Chinese indigenous chicken breeds are geographically widespread, and a total of 116 indigenous chicken breeds are listed as Chinese national genetic resources. However, these indigenous chicken breeds are facing serious challenges as declining population and germplasm degeneration because lots of commercial chicken breeds had been introduced. In this study, the genetic variations of eleven Chinese indigenous chicken breeds of Sichuan province and three commercial chicken breeds were investigated based on the partial mitochondrial DNA D-loop of 487bp in length. 147 individuals from 14 breeds were examined and 34 haplotypes were observed. Genetic diversity analysis showed that the highest haplotype diversity level was found in Dahen Chicken (DH)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chinese chicken; Mitochondrial DNA; Cluster analysis; Gene flow; Phylogeny.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000400308

Ingredient classification according to the digestible amino acid profile: an exploratory analysis
Provedor de dados: 89
Autores: Faria Filho,DE; Torres,KAA; Campos,DMB; Vieira,BS; Urbano,T; Rosa,PS; Ferraudo,AS.
This study aimed: 1) to classify ingredients according to the digestible amino acid (AA) profile; 2) to determine ingredients with AA profile closer to the ideal for broiler chickens; and 3) to compare digestible AA profiles from simulated diets with the ideal protein profile. The digestible AA levels of 30 ingredients were compiled from the literature and presented as percentages of lysine according to the ideal protein concept. Cluster and principal component analyses (exploratory analyses) were used to compose and describe groups of ingredients according to AA profiles. Four ingredient groups were identified by cluster analysis, and the classification of the ingredients within each of these groups was obtained from a principal component analysis,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler chicken; Cluster analysis; Ideal protein; Ingredients; Principal component analysis.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2005000300009

Magnetic susceptibility to identify landscape segments on a detailed scale in the region of Jaboticabal, São Paulo, Brazil
Provedor de dados: 90
Autores: Barrios,Mariana dos Reis; Marques Junior,José; Panosso,Alan Rodrigo; Siqueira,Diego Silva; La Scala Junior,Newton.
The agricultural potential is generally assessed and managed based on a one-dimensional vision of the soil profile, however, the increased appreciation of sustainable production has stimulated studies on faster and more accurate evaluation techniques and methods of the agricultural potential on detailed scales. The objective of this study was to investigate the possibility of using soil magnetic susceptibility for the identification of landscape segments on a detailed scale in the region of Jaboticabal, São Paulo State. The studied area has two slope curvatures: linear and concave, subdivided into three landscape segments: upper slope (US, concave), middle slope (MS, linear) and lower slope (LS, linear). In each of these segments, 20 points were randomly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Landforms; Principal component analysis; Cluster analysis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000400002

Multivariate analysis and geostatistics of the fertility of a humic rhodic hapludox under coffee cultivation
Provedor de dados: 90
Autores: Silva,Samuel de Assis; Lima,Julião Soares de Souza.
The spatial variability of soil and plant properties exerts great influence on the yeld of agricultural crops. This study analyzed the spatial variability of the fertility of a Humic Rhodic Hapludox with Arabic coffee, using principal component analysis, cluster analysis and geostatistics in combination. The experiment was carried out in an area under Coffea arabica L., variety Catucai 20/15 - 479. The soil was sampled at a depth 0.20 m, at 50 points of a sampling grid. The following chemical properties were determined: P, K+, Ca2+, Mg2+, Na+, S, Al3+, pH, H + Al, SB, t, T, V, m, OM, Na saturation index (SSI), remaining phosphorus (P-rem), and micronutrients (Zn, Fe, Mn, Cu and B). The data were analyzed with descriptive statistics, followed by principal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica L; Precision agriculture; Principal components; Cluster analysis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000200016

CHEMICAL AND PHENOTYPIC DIVERSITY OF MEXICAN PLUMS (Spondias purpurea L.) FROM THE STATES OF GUERRERO AND MORELOS, MEXICO
Provedor de dados: 94
Autores: ASTUDILLO,YANIK IXCHEL MALDONADO; TEJACAL,IRÁN ALIA; NÚÑEZ-COLÍN,ALBERTO CARLOS; HERNÁNDEZ,JAVIER JIMÉNEZ; MARTÍNEZ,VÍCTOR LÓPEZ.
ABSTRACT  Fruits from 86 ecotypes of Mexican plum were harvested from the states of Guerrero and Morelos during the dry season. Of these, 22 were wild ecotypes and 64 were cultivated varieties. Among the variables measured, those with the highest variation coefficients were color, flavor, and mass (&gt; 45%), highlighting the presence of considerable intra-species variability. Cluster analysis separated the 86 accessions into 5 groups, mainly on the basis of color, flavor, length, and mass. Members from the first three groups had red (Group I), yellow (Group II), or purple (Group III) epicarps and higher values of mass (12.2-16 g), length (29.6-33.9 mm), pulp yield (68.8-71.9% ), TSS (11.16-11.52 °Brix) and flavor index (14.5-18.3), making them suitable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quality; Canonical discriminant analysis; Cluster analysis; Genetic diversity; Underutilized crops.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000200302

PREVENTION OF CHILLING INJURY IN 'TOMMY ATKINS' MANGOES PREVIOUSLY STORED AT 5 ºC, USING HEAT TREATMENT AND RADIATION UV (UV-C)
Provedor de dados: 94
Autores: MIGUEL,ANA CAROLINA ALMEIDA; DURIGAN,JOSÉ FERNANDO; MARQUES,KELLY MAGALHÃES; MORGADO,CRISTIANE MARIA ASCARI; FERRAUDO,ANTONIO SERGIO.
ABSTRACT  The objective of this study was to evaluate the effect of heat treatment and ultraviolet radiation (UV-C) in the prevention of chilling injury in mangoes cv. Tommy Atkins previously stored or not under injury condition after their transference to ambient condition. Fruits were divided into groups: two were hydrothermally treated (46.1 ºC/90 min; 55 ºC/5 min) and two were exposed to UV-C radiation (1.14 kJ m-2; 2.28 kJ m-2). These groups were stored under chilling injury conditions (5 ºC for 14 days), as established in preliminary tests. Other untreated groups were stored at 12 ºC or 5 ºC. After the storage period, they were transferred to ambient conditions (21.9 ºC; 55% RH) and the quality was evaluated. All the data were submitted to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangifera indica; Ultraviolet radiation; Thermal treatment; Factor analysis; Cluster analysis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452016000100053

Traditional and alternative nonlinear models for estimating the growth of Morada Nova sheep
Provedor de dados: 96
Autores: Souza,Laaina de Andrade; Carneiro,Paulo Luiz Souza; Malhado,Carlos Henrique Mendes; Silva,Fabyano Fonseca e; Silveira,Fernanda Gomes da.
In the present study, alternative and traditional nonlinear models to describe growth curves of Morada Nova sheep reared in the state of Bahia, Brazil, were applied. The nonlinear models were: Schnute, Mitscherlich, Gompertz, Logistic, Meloun I Meloun II, III Meloun, Gamito and Meloun IV. The model adjustment was evaluated by using: Adjusted Coefficient of Determination (R²aj), Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC), Mean Squared Error of Prediction (MEP) and Coefficient of Determination of Prediction (R²p). The selection of the best model was based on cluster analysis, using the evaluators as variables. Six out of the nine tested models converged, while Meloun I and Meloun IV were equally effective in explaining animal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Growth curve; Naturalized breed.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000900007

Phenotypic diversity between Brazilian fighting cocks and naturalized roosters
Provedor de dados: 96
Autores: Ibiapina Neto,Vicente; Barbosa,Firmino José Vieira; Campelo,José Elivalto Guimarães; Sarmento,José Lindenberg Rocha; Santos,Natanael Pereira da Silva; Carvalho,Marcos David Figueiredo de.
ABSTRACT The present study was carried out to evaluate the phenotypic diversity between fighting cocks; roosters of the naturalized ecotypes Graúna Dourada, Brejeira, Teresina, and Nordestina; roosters of the Sertaneja genetic (synthetic) group; and family-farmed roosters via descriptive and multivariate analyses. The qualitative traits evaluated by descriptive analysis indicated a prevalence of single comb in the Graúna Dourada, Teresina, Nordestina, and Sertaneja ecotypes, whereas the Brejeira ecotype, fighting cocks, and family-farmed roosters have a pea-type comb, which can be viewed as a sign of introgression of the fighting cock in flocks of the region. Dark plumage prevailed across the groups. The quantitative traits subjected to multivariate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Morphometry; Multivariate analysis; Principal component analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100303

Segmentation of the buffalo meat consumer market in Belém, Pará, Brazil
Provedor de dados: 96
Autores: Marques,Cristiane Soares Simon; Oaigen,Ricardo Pedroso; Moraes,Carina Martins de; Santos,Marcos Antônio Souza dos; Lourenço Júnior,José de Brito; Abel,Isis.
ABSTRACT The objective of this study was to identify different market segments for buffalo meat with target groups defined in the city of Belém, Pará, Brazil. Paired samples of beef and buffalo meat were given to 447 volunteers, and a sensory analysis of the products was conducted. After the tasting, a questionnaire was administered to obtain demographic (age, educational level, marital status) and economic (household income) data as well as information on the habits of respondents and preferences regarding buffalo meat. The factors were estimated using the principal components method and the factors with characteristic roots greater than one were extracted. To check the suitability of the factorial model, Bartlett’s sphericity test and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Buffalo meat; Cluster analysis; Consumers.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000600336

Advantages and challenges for Brazilian export of frozen beef
Provedor de dados: 96
Autores: Pereira,Paulo Rodrigo Ramos Xavier; Barcellos,Júlio Otávio Jardim; Federizzi,Luiz Carlos; Lampert,Vinícius do Nascimento; Canozzi,Maria Eugênia Andrighetto; Marques,Pedro Rocha.
The objectives of this research were to analyse data on the international market of frozen boneless beef and to classify its participants into groups according to their trade relationships, identifying the main factors that influence the preference of a country to beef from a determined supplier country. International beef trade is composed of two markets: in one of them, the relationships between supplier and client depend on the lowest price, and Brazil is found in favorable conditions; and the other, the relationships are preferably based on the sanitary quality of the herd and traceability systems recognized by the purchaser, to which Brazilian participation is low.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bovine spongiform encephalopaty (BSE); Cluster analysis; Data mining; Foot and mouth disease; International trade beef.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000100028

Altitudinal vegetation belts in the high-Andes of central Chile (33°S)
Provedor de dados: 97
Autores: Cavieres,Lohengrin A.; Peñaloza,Alejandro; Kalin Arroyo,Mary.
The limits of alpine vegetation belts have been established mainly based on physiognomic criteria. However, a more objective approach for fixing limits of vegetation belts are methods based on species composition and relative abundance of each species. While these methods are more time consuming, they are more detailed and permit the detection of physical factors affecting the limits of vegetation belts. In this paper we: 1) describe the altitudinal changes of vegetation above timberline, 2) compare vegetation belts defined with physiognomy and two floristic methods (a qualitative one based on altitudinal changes in species composition, and a quantitative one based on changes in dominant species); and 3) detect some environmental factors responsible for...
Tipo: Journal article
Palavras-chave: Altitudinal vegetation belts; Alpine vegetation; Andes; Central Chile; Cluster analysis.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000200008

Multivariate analyses to establish reference values for soils in Médio Paraíba, state of Rio de Janeiro, Brazil
Provedor de dados: 124
Autores: Mattos,Amanda Guimarães de; Lima,Erica Souto Abreu; Amaral Sobrinho,Nelson Moura Brasil do; Zoffoli,Hugo José de Oliveira; Pérez,Daniel Vidal.
ABSTRACT Quality Reference Values (QRVs) for potentially toxic elements are obtained from background levels in soils. However, this determination from mean values or percentiles is not appropriate given the variability in the natural distribution of these elements in soils. Therefore, the objective of this study was to propose a new methodology to establish the QRVs, using the Médio Paraíba region (RJ, Brazil) as an example, from groups of soils defined based on the pseudo-total levels of B, Ba, Co, Cr, Cu, Ni, Pb, and Zn through the use of multivariate analyses and discriminant functions. A total of 40 points, collected at depths of 0-20 and 20-40 cm, were used for the determination of pseudo-total contents, according to the EPA 3051A methodology. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Guiding values; Heavy metals; Cluster analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000100001

Molecular characterisation and similarity relationships among iranian basil (Ocimum basilicum L.) accessions using inter simple sequence repeat markers
Provedor de dados: 124
Autores: Aghaei,Mohammad; Darvishzadeh,Reza; Hassani,Abbas.
The study of genetic relationships is a prerequisite for plant breeding activities as well as for conservation of genetic resources. In the present study, genetic diversity among 50 Iranian basil (Ocimum basilicum L.) accessions was determined using inter simple sequence repeat (ISSR) markers. Thirty-eight alleles were generated at 12 ISSR loci. The number of alleles per locus ranged from 1 to 5 with an average of 3.17. The maximum number of alleles was observed at the A7, 818, 825 and 849 loci, and their size ranged from 300 to 2500 bp. A similarity matrix based on Jaccard's coefficient for all 50 basil accessions gave values from 1.00-0.60. The maximum similarity (1.00) was observed between the "Urmia" and "Shahr-e-Rey II" accessions as well as between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Basil; Cluster analysis; Molecular markers; Plant genetic diversity.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902012000200014

Genetic variation in oriental tobacco (Nicotiana tabacum L.) by agro-morphological traits and simple sequence repeat markers
Provedor de dados: 124
Autores: Darvishzadeh,Reza; Mirzaei,Leila; Maleki,Hamid Hatami; Laurentin,Hernan; Alavi,Seyyed Reza.
The objectives of this study were to assess genetic diversity and determine differences between several oriental tobacco genotypes by examining both agro-morphological traits and molecular markers. Simple lattice design with two replications was used to evaluate 100 oriental tobacco genotypes. Analysis of variance manifested that there is high level of genetic diversity in oriental-type tobaccos based on morphological traits including number of leaf, days to 50% flowering, leaf length, leaf width, leaf fresh weight, leaf dry weight, stem height and stem girth. Classification of genotypes using agro-morphological data by means of un-weighted pair-group method using arithmetic average (UPGMA) algorithm based on squared standardized Euclidean distances...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Euclidean distance; Genetic diversity; Jaccard's similarity; Oriental tobacco.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000200018

Environmental group identification for upland rice production in central Brazil
Provedor de dados: 63
Autores: Heinemann,Alexandre Bryan; Sentelhas,Paulo Cesar.
Upland rice (Oryza sativa L.) production is basically concentrated in four central Brazilian States, Mato Grosso, Goiás, Rondônia and Tocantins. To reduce the genotype and environment (G × E) interactions, the classification of environment groups was proposed. The goal of this study explores possibilities to adjust the upland rice regional breeding systems to optimally fit to the range of environments they are targeting, based on a historical yield data set of the Brazilian Geographic and Statistics Institute (IBGE, www.ibge.gov.br/home/) from 54 microregions. The specific objectives of this study were: (i) to identify and classify environmental groups in the Brazilian upland rice production area; (ii) to validate these environmental groups using yield...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environment classification; Breading program; Cluster analysis; Yield.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500005

Mulch materials in processing tomato: a multivariate approach
Provedor de dados: 63
Autores: Moreno,Marta María; Moreno,Carmen; Tarquis,Ana María.
Mulch materials of different origins have been introduced into the agricultural sector in recent years alternatively to the standard polyethylene due to its environmental impact. This study aimed to evaluate the multivariate response of mulch materials over three consecutive years in a processing tomato (Solanum lycopersicon L.) crop in Central Spain. Two biodegradable plastic mulches (BD1, BD2), one oxo-biodegradable material (OB), two types of paper (PP1, PP2), and one barley straw cover (BS) were compared using two control treatments (standard black polyethylene [PE] and manual weed control [MW]). A total of 17 variables relating to yield, fruit quality, and weed control were investigated. Several multivariate statistical techniques were applied,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mulching; Principal component analysis; Cluster analysis; Discriminant analysis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000400005

PAIRWISE ASSOCIATION AS A CRITERION FOR THE SELECTION OF COLLECTION SITES OF NATURAL ENEMIES OF THE CASSAVA GREEN MITE,  Mononychellus tanajoa (BONDAR)
Provedor de dados: 63
Autores: RODRIGUES,G.S.; PARAÍBA,L.C.; MORAES,G. J. de.
Climatic similarity has been the primary parameter considered in the selection of sites for the collection and release of natural enemies in classical biological control programs. However, acknowledging the relevance of the composition of biological communities can be essential for improving the record of successful biocontrol projects, in relation to the proper selection of collection sites. We present in this paper an analysis of the plant and mite assemblages in cassava fields of northeastern Brazil. Such analysis is suggested as an additional criterion for the selection of collection sites of mite predators of the cassava green mite, Mononychellus tanajoa (Bondar), in an international biological control program. Contingency TABLES were built using...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological control; Cluster analysis; Cassava green mite; Mononychellus tanajoa.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200022

การจำแนกความหลากหลายของเชื้อพันธุกรรมข้าวด้วยลักษณะสัณฐานวิทยา
Provedor de dados: 106
Autores: Kittima Ruksopa; Prachack Lengbumrung; Perapol Muangngam.
Classification of rice genetic diversity aims to study the genetic relationship and reduce the duplication of collected rice varieties in the National Rice Seed Storage Laboratory for Genetic Resources.  Cluster analysis of the morphological and agronomic traits of 211 rice varieties was calculated by Simple Matching and Square Euclidean as well as clustered by UPGMA and Ward method, respectively.  Cluster based on morphology having 6 main groups indicated that the highest number of members within the group was Group 1 consisting of 137 rice varieties, followed by Group 2, 3, 15, 6 and 9 consisting of 16, 12, 6, 5 and 3 rice varieties, respectively.  Cluster by agronomic traits having 9 main groups showed that the highest number of members was Group3...
Tipo: PhysicalObject
Palavras-chave: Rice; Genetic diversity; Cluster analysis; Morphological traits; Coefficient similarity; ข้าว; เชื้อพันธุกรรม; การวิเคราะห์กลุ่ม; ลักษณะสัณฐานวิทยา; สัมประสิทธิ์ความเหมือน; ลักษณะทางการเกษตร.
Ano: 2014
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5638

ประสิทธิภาพการใช้ปุ๋ยไนโตรเจนและความทนทานต่อสภาพไนโตรเจนต่ำในข้าวโพดข้าวเหนียว
Provedor de dados: 106
Autores: Kitti Boonlertnirun; Choosak Jompuk.
Nitrogen use efficiency was evaluated in 27 genotypes of waxy corn to utilize as germplasm in breeding program for sustainable agriculture. Yield, yield components and agronomic traits analyzed similarity coefficient by Squared Euclidean and cluster analysis by Ward’s method could separate genotypes into 4 groups depending on ear size, plant height and flowering date. The large ear group gave yield higher than that of the small ear group and showed high value of low nitrogen tolerant index (LNTI) and nitrogen use efficiency (NUE). The genotypes, namely BW, PEK and SLKM showed high NUE, high yield in high nitrogen condition (HN) and low yield in low nitrogen condition (LN). WPP, BW and NSW genotypes showed high value of LNTI, and high yield in both low and...
Tipo: Collection
Palavras-chave: Waxy corn; Correlation; Low nitrogen tolerant index; Low nitrogen susceptible index; Cluster analysis; ข้าวโพดข้าวเหนียว; ปุ๋ยไนโตรเจน; ดัชนีความทนทานต่อสภาพไนโตรเจนต่ำ; ดัชนีความอ่อนแอต่อสภาพไนโตรเจนต่ำ; ค่าสหสัมพันธ์; องค์ประกอบผลผลิต; ผลผลิต; ลักษณะทางการเกษตร; การวิเคราะห์จัดกลุ่ม; การปรับปรุงพันธุ์.
Ano: 2011
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5197

Phytophilous cladocerans (Crustacea, Anomopoda and Ctenopoda) from Paranã River Valley, Goiás, Brazil
Provedor de dados: 104
Autores: Elmoor-Loureiro,Lourdes M. A.
A rapid assessment survey identified 39 phytophilous cladocerans species from littoral zones of rivers, permanent and temporary lagoons, and swamps of the Paranã River Valley, Goiás, Brazil, 22 are registered for the first time in Central Brazil. Aspects of the taxonomy of some of these species are discussed. Cluster analysis (UPGMA) revealed two phytophilous cladoceran assemblages, characterized by higher or lower richness and relative abundance of species of the families Daphniidae and Moinidae (filter feeders), in comparison with the dominant families Chydoridae and Macrothricidae (scraper feeders).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cladocera; Cluster analysis; Phytophilous fauna; Species richness.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000200012

Disentangling structural patterns of natural forest fragments in a savanna matrix in the eastern Brazilian Amazon
Provedor de dados: 36
Autores: AMARAL,Iêda Leão do; MAGNUSSON,William Ernest; MATOS,Francisca Dionízia de Almeida; ALBERNAZ,Ana Luisa K.; FEITOSA,Yuri Oliveira; GUILLAUMET,Jean-Louis.
ABSTRACT Natural fragments are an important source of richness for the management and conservation of a local flora. The objective of this study was to evaluate the effect of fragmentation on the structure and composition of the plant communities of forest fragments (FF) in Alter do Chão, eastern Brazilian Amazonia. The study sample consisted of 25 FF and nine continuous forest (CF) sites. We compared plant density and species richness between site categories by t-tests, analyzed the differences in composition by cluster analysis, and assessed the effect of fragment size and distance to CF on the basal area and diameter of FF assemblages by linear regression. Individual trees and shrubs with DBH ≥1.27 cm were measured in 2x250 m plots. 17,078 individuals...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bray-Curtis; Cluster analysis; Diameter structure; Small trees.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000200111

Comparative leaf anatomy and micromorphology of Psychotria species (Rubiaceae) from the Atlantic Rainforest
Provedor de dados: 39
Autores: Moraes,Tarsila Maria da Silva; Rabelo,Guilherme Rodrigues; Alexandrino,Camilla Ribeiro; Silva Neto,Sebastião José da; Da Cunha,Maura.
The genus Psychotria comprises approximately 2,000 species that are mostly shrubs distributed in forests of the tropics and subtropics. Within the Rubiaceae, Psychotria is well known for its species that produce bioactive alkaloids and for its taxonomic complexity. The anatomical and micromorphological characters of the leaves of P. hoffmannseggiana, P. carthagenensis, P. deflexa, P. glaziovii, P. leiocarpa, P. racemosa, and P. vellosiana were investigated and described to understand the interspecific variation of these species, which will contribute to the systematics of the genus. Principal component analysis (PCA) and unweighted pair group method analysis (UPGMA) indicated four groups based on the presence or absence of some of the characters studied....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf anatomy; Cluster analysis; Principal component analysis; Systematic anatomy; Domatia; Leaf surface morphology.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000100021

Mixed rain forest in southeastern Brazil: tree species regeneration and floristic relationships in a remaining stretch of forest near the city of Itaberá, Brazil
Provedor de dados: 39
Autores: Ribeiro,Tiago Maciel; Ivanauskas,Natália Macedo; Martins,Sebastião Venâncio; Polisel,Rodrigo Trassi; Santos,Rochelle Lima Ramos dos; Miranda Neto,Aurino.
The aim of this work was to evaluate the floristic composition, richness, and diversity of the upper and lower strata of a stretch of mixed rain forest near the city of Itaberá, in southeastern Brazil. We also investigated the differences between this conservation area and other stretches of mixed rain forest in southern and southeastern Brazil, as well as other nearby forest formations, in terms of their floristic relationships. For our survey of the upper stratum (diameter at breast height [DBH] &amp;gt; 15 cm), we established 50 permanent plots of 10 × 20 m. Within each of those plots, we designated five, randomly located, 1 × 1 m subplots, in order to survey the lower stratum (total height &amp;gt; 30 cm and DBH &lt; 15 cm). In the upper stratum, we...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucaria angustifolia; Cluster analysis; Ecotone; Phytogeography; Phytosociology.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000100010

Pollen morphology of species of Graphistylis B. Nord. (Asteraceae) of Brazil
Provedor de dados: 39
Autores: Souza,Mariana Albuquerque de; Mendonça,Claudia Barbieri Ferreira; Esteves,Roberto Lourenço; Gonçalves-Esteves,Vania.
This paper presents the results of a palynological study of the species ofGraphistylis that were segregated fromSenecio (s.l.) (Seneciosect. Dichroa) and that are all endemic of Brazil. These species are found in mountainous regions of the states of Espirito Santo, Minas Gerais, Paraná, Rio de Janeiro, São Paulo and Santa Catarina. The pollen grains of eight species were acetolyzed and analyzed and photographed using light microscopy. Unacetolyzed pollen grains were analyzed and photomicrographed using scanning electron microscopy. The current study undertook a palynologically analysis of Graphistylis in order to obtain information useful for making a better ranking of these genus. The results show medium-sized pollen grains that were oblate spheroidal or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Ordination analysis; Palynology; Pollen grains; Senecioneae.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100138

Comparison of multiallelic distances for the quantification of genetic diversity in the papaya - doi: 10.4025/actasciagron.v33i1.11698
Provedor de dados: 1
Autores: Ramos, Helaine Christine Cancela; Universidade Estadual do Norte Fluminense; Pereira, Messias Gonzaga; Universidade Estadual do Norte Fluminense Darcy Ribeiro; Gonçalves, Leandro Simões Azeredo; Universidade Estadual do Norte Fluminense; Amaral Júnior, Antonio Teixeira do; Universidade Estadual do Norte Fluminense; Scapim, Carlos Alberto; Universidade Estadual de Maringá.
This study aimed to compare multiallelic distances to quantify genetic diversity in papaya. We evaluated forty-three individuals in the S2 generation, from the backcross between F1 (Cariflora x SS783) and Cariflora, and four accessions from the UENF/Caliman Germplasm Bank. Genetic distances used were Smouse and Peakall (1999), Kosman and Leonard (2005) and weighted index. Clustering among genotypes was performed using the hierarchical unweighted pair-group method with arithmetic mean analysis (UPGMA) and projection of the distance on the bidimensional plan. A high correlation between genetic distances was observed; however, through UPGMA group analysis, the distance determined by the weighted index provided the complete separation of 52BC1S2-08, 52BC1S2-29...
Palavras-chave: Carica papaya L.; Microsatellite markers; Cultivar characterization; Cluster analysis Carica papaya L.; Microsatellite markers; Cultivar characterization; Cluster analysis.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/11698

Parental selection for the formation of interspecific hybrid populations of oil palm
Provedor de dados: 1
Autores: Peixoto, Leonardo de Azevedo; Bhering, Leonardo Lopes; Gurgel, Fábio de Lima; Gomes Junior, Rui Alberto.
The objective of this work was to select families with superior performance and large genetic variability for diallel crosses for potential use in the pre-breeding of oil palm. The experiment consisted of 42 full-sib families divided into three trials with 16 families and 3 witnesses in common in randomized blocks, with four blocks and 12 plants per block. The characteristics evaluated in the experiment were number of bunches per plant (NBP), bunch weight per plant (BWP) and bunch average weight per plant (BAW). The estimation of variance components showed that there was greater genetic variance within families than between families. The heritability for all traits was high, above 0.75, and the coefficient of environmental variation was low to moderate for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ciências Agrárias e genética e melhoramento de plantas Elaeis guineensis; Cluster analysis; Genetic diversity Melhoramento.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19145

How the calving order of cows affects the performance of Nellore calves
Provedor de dados: 2
Autores: Silveira, Rafael Kill; Jangarelli, Marcelo.
This study aimed to verify the effect of age of dam on the performance of male and female Nellore calves, using the following variables: average daily gain (ADG), adjusted weight for 205 days of age (W205), and number of days to reach 160 kg (D160). Information were collected from a commercial herd consisting of 1,122 calves and 1,009 heifers and their mothers. To classify animals with similar performance based on the cows’ calving orders (age of dam), the multivariate cluster analysis was adopted through the complete linkage hierarchical method. The best performance was observed in the calves of cows in their sixth calving at most; for heifers, the best performance was seen in those born to cows in their eighth calving at most. Cows in their eighth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zootecnia  Produção animal average daily gain; Cluster analysis; Cow age; Number of days to reach 160 kg; Weaning weight.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/34519

Classification of Potential Sheep Heat-Stress Levels According to the Prevailing Meteorological Conditions
Provedor de dados: 111
Autores: Dimitris K. Papanastasiou.
Many researchers have found that physiology, welfare, health, and productivity of ruminants are significantly affected when they are exposed to heat-stress conditions. In such cases, heat-stress may also cause a reduction of farmers&amp;rsquo; profit in various ways. Heat-stress levels are significantly affected by the prevailing meteorological conditions. This paper aims to study the potential daily peak heat-stress conditions to which sheep are exposed and to classify them according to the prevailing meteorological conditions. For these purposes, temperature, relative humidity, wind speed and incoming solar radiation data were analyzed. The meteorological data were recorded during the summers of the period 2007 &amp;ndash; 2012 by an automated...
Palavras-chave: Sheep; Heat-stress; Temperature humidity index; Meteorological conditions; Cluster analysis; Greece.
Ano: 2015
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3099

Classification of Potential Sheep Heat-Stress Levels According to the Prevailing Meteorological Conditions
Provedor de dados: 111
Autores: Papanastasiou, Dimitris K.
Many researchers have found that physiology, welfare, health, and productivity of ruminants are significantly affected when they are exposed to heat-stress conditions. In such cases, heat-stress may also cause a reduction of farmers’ profit in various ways. Heat-stress levels are significantly affected by the prevailing meteorological conditions. This paper aims to study the potential daily peak heat-stress conditions to which sheep are exposed and to classify them according to the prevailing meteorological conditions. For these purposes, temperature, relative humidity, wind speed and incoming solar radiation data were analyzed. The meteorological data were recorded during the summers of the period 2007 – 2012 by an automated meteorological station that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sheep; Heat-stress; Temperature humidity index; Meteorological conditions; Cluster analysis; Greece.
Ano: 2015
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3099

Genetic diversity, population structure and AFLP markers associated with maize reaction to southern rust
Provedor de dados: 53
Autores: Giordani,Willian; Scapim,Carlos Alberto; Ruas,Paulo Maurício; Ruas,Claudete de Fátima; Contreras-Soto,Rodrigo; Coan,Marlon; Fonseca,Inês Cristina de Batista; Gonçalves,Leandro Simões Azeredo.
ABSTRACT Maize is one of the species with greater genetic diversity among cereals and possibly the most diverse crop species known. Accessing this variability is essential for maize breeding, allowing breeders to achieve progress of yield increasing, overcome environmental challenges or deal with pests and diseases. Among the maize diseases, southern rust is one of the most important, causing significant losses in yield and presenting severe epidemics worldwide. In the present study, the AFLP technique was applied to analyze population structure and genetic diversity among 145 tropical maize inbred lines, and to test for preliminary evidence of association between AFLP markers and the reaction to southern rust. Disease severity was evaluated in two crop...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Gwas; Association studies; Cluster analysis; Genetic distance; Puccinia polysora.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000200183

Evaluation of Genetic Diversity amongthe Pakistani Wheat (Triticumaestivum L.) Lines through Random Molecular Markers
Provedor de dados: 52
Autores: Zeshan,Ali; Afzal,Muhammad; Alghamdi,Salem S.; Kettener,Karien; Ali,Mubashar; Mubushar,Muhammad; Ahmad,Shakeel.
ABSTRACT The presence of geneticdiversity is of great importance in improving wheat traits and developing strategies for optimal conservation of germplasm. Genetic diversity was assessed among common wheat cultivars using RAPD (Random Amplified Polymorphic DNA) markers at the Center of Agriculture, Biochemistry and Biotechnology (CABB), University of Agriculture, Faisalabad. RAPD primers were used among 14 Pakistani wheat cultivars, to screen the progenies and for the identification of the genes of interest. The polymorphic information content (PIC), was measured as the percentage of polymorphic fragments for all primers. A total of 583 bands(84% polymorphic) in all 14 wheat cultivars was amplified and discriminated all the wheat genotypes. The number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wheat; RAPD; Genetic diversity; PCoA; Cluster analysis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100432

Phenotypic Diversity of Apple (Malus sp.) Germplasm in South Serbia
Provedor de dados: 52
Autores: Mratinić,Evica; Akšić,Milica Fotirić.
To determine the overall degree of polymorphism, detect similarities among the accessions and collect highly valued genotypes of native apples, 21 characters of 18 autochthonous apple cultivars were studied for three years. Particular individual accessions were selected from the south region of Serbia according to economically valuable characters and tested in situ. Agronomic evaluation of germplasm accessions revealed considerable diversity among different accessions for all the characters studied. The analysis of variance revealed significant differences among the accessions and among years for some characters as well. Cluster analysis distinguished Malus sp. accessions into three distinct groups. Despite of the significant differences among the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apple; Cluster analysis; Diversity; Genetic resources.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000300004

Description and analysis of genetic diversity among squash accessions
Provedor de dados: 52
Autores: Tsivelikas,Athanasios L.; Koutita,Olga; Anastasiadou,Anastasia; Skaracis,George N.; Traka-Mavrona,Ekaterini; Koutsika-Sotiriou,Metaxia.
In this work, the part of the squash core collection, maintained in the Greek Gene Bank, was assessed using the morphological and molecular data. Sixteen incompletely classified accessions of the squash were characterized along with an evaluation of their resistance against two isolates of Fusarium oxysporum. A molecular analysis using Random Amplified Polymorphic DNA (RAPD) markers was also performed, revealing high level of polymorphism. To study the genetic diversity among the squash accessions, a clustering procedure using Unweighed Pair Group Method and Arithmetic Average (UPGMA) algorithm was also adopted. Two independent dendrograms, one for the morphophysiological and one for molecular data were obtained, classifying the accessions into two and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Gower's distance; Morphophysiological characteristics; Principal Component Analysis; RAPD markers; Winter squash.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000200003

Classification of different degrees of adiposity in sedentary rats
Provedor de dados: 56
Autores: Leopoldo,A.S.; Lima-Leopoldo,A.P.; Nascimento,A.F.; Luvizotto,R.A.M.; Sugizaki,M.M.; Campos,D.H.S.; da Silva,D.C.T.; Padovani,C.R.; Cicogna,A.C.
In experimental studies, several parameters, such as body weight, body mass index, adiposity index, and dual-energy X-ray absorptiometry, have commonly been used to demonstrate increased adiposity and investigate the mechanisms underlying obesity and sedentary lifestyles. However, these investigations have not classified the degree of adiposity nor defined adiposity categories for rats, such as normal, overweight, and obese. The aim of the study was to characterize the degree of adiposity in rats fed a high-fat diet using cluster analysis and to create adiposity intervals in an experimental model of obesity. Thirty-day-old male Wistar rats were fed a normal (n=41) or a high-fat (n=43) diet for 15 weeks. Obesity was defined based on the adiposity index; and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Obesity; Adiposity index; Rats; Cluster analysis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2016000400601

Rhizobial characterization in revegetated areas after bauxite mining
Provedor de dados: 58
Autores: Borges,Wardsson Lustrino; Prin,Yves; Ducousso,Marc; Le Roux,Christine; Faria,Sergio Miana de.
Abstract Little is known regarding how the increased diversity of nitrogen-fixing bacteria contributes to the productivity and diversity of plants in complex communities. However, some authors have shown that the presence of a diverse group of nodulating bacteria is required for different plant species to coexist. A better understanding of the plant symbiotic organism diversity role in natural ecosystems can be extremely useful to define recovery strategies of environments that were degraded by human activities. This study used ARDRA, BOX-PCR fingerprinting and sequencing of the 16S rDNA gene to assess the diversity of root nodule nitrogen-fixing bacteria in former bauxite mining areas that were replanted in 1981, 1985, 1993, 1998, 2004 and 2006 and in a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhizobia; Rep-PCR; Cluster analysis; Nodules; Mining.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000200314

Typing Candida albicans oral isolates from healthy Brazilian schoolchildren using multilocus enzyme electrophoresis reveals two highly polymorphic taxa
Provedor de dados: 58
Autores: Boriollo,Marcelo Fabiano Gomes; Spolidorio,Denise Madalena Palomari; Barros,Letizia Monteiro; Bassi,Rodrigo Carlos; Garcia,José Antonio Dias; Costa,Ana Maria Duarte Dias; Rosa,Edvaldo Antonio Ribeiro; Höfling,José Francisco.
The genetic diversity of C. albicans oral isolates from 75 healthy schoolchildren from eight schools located in different geographic areas of Piracicaba city, São Paulo state, Brazil, was established using isoenzymes marker (Multilocus Enzyme Electrophoresis - MLEE) and cluster analysis. Patterns of monoclonal and polyclonal oral colonization by C. albicans within and between groups of schoolchildren were identified. However, significant divergence between the observed and the expected genotypic frequencies (Hardy-Weinberg equilibrium test) was not detected in the geographically adjacent groups, suggesting the hypothesis that populations of healthy schoolchildren do not correspond to the selection factor (differential survival) of strains. Two highly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Candida albicans; Healthy schoolchildren; Geographic region; MLEE; Cluster analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000300023

Acceptance of Transgenic Milk in La Araucania Region,Chile
Provedor de dados: 117
Autores: Schnettler M,Berta; Sepúlveda B,Oriana; Ruiz F,Danilo.
Considering the high level of concern caused by genetically modified foods (GMF) in developed countries, the relevance of this variable in decision-making about the purchase of fluid milk among consumers in Temuco (La Araucanía Region, Chile) was determined. By means of a personal survey of 400 people and using conjoint analysis, it was determined that the presence of genetic modifications in food was more important (44.7%) than brand (29.5%) and price (25.5%) in the decision-making process. By cluster analysis three segments were identified; the largest group (46.5%) gave similar relevance to food production and brand, preferring genetically modified milk. For the second group (41.5%), the presence or absence of genetic modification was the most important...
Tipo: Journal article
Palavras-chave: Genetically modified foods (GMF); Fluid milk; Cluster analysis; Conjoint analysis.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000400008

Consumer Perception of Animal Welfare and Livestock Production in the Araucania Region , Chile
Provedor de dados: 117
Autores: Schnettler M,Berta; Vidal M,Ricardo; Silva F,Roberto; Vallejos C,Lisette; Sepúlveda B,Néstor.
Given the importance of animal welfare (AW) in developed countries, a survey was carried out among 384 consumers in Temuco, Chile, to establish their knowledge and perceptions about animals handling during production, to detect preferences for meat produced under AW principles, their willingness to pay a higher price for this and to distinguish different consumer segments. Approximately 60% of people surveyed knew about livestock management practices, half of them considered that these practices had a negative effect on the animals, but only 32.1% have changed their meat consumption habits due to this. Seventy percent of the people surveyed had over 50% of knowledge about AW aspects. There is a strong preference and willingness to pay a higher price for...
Tipo: Journal article
Palavras-chave: Animal welfare; Market segmentation; Cluster analysis.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000100008

Production systems, technical parameters and quality of bovine milk producers in southern Chile
Provedor de dados: 118
Autores: Pérez,Jorge A.
Production information of 29 milk producers in the southern region of Chile was studied with the objective of characterizing and classifying different dairy production systems, evaluating various associations between quantitative and qualitative studied variables and analyzing the effect of the production system and the quality of bovine milk according to the month of the year that it was processed. The classification of production groups was based on the implementation of the exploratory multivariate technique, main components analysis and conglomerates or cluster analysis. The applied statistical model was: y ijk = µ + Mi + SPj + MSPij + e ijk, where y ijk=dependent variables (fat, protein, count of somatic cells and colony forming units); µ=general...
Tipo: Journal article
Palavras-chave: Cluster analysis; Colony forming units; Fat percentage; Main components analysis; Multivariable analysis; Protein percentage; Somatic cell.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000100002

Spatial variability of an Alfisol cultivated with sugarcane
Provedor de dados: 118
Autores: Silva Cruz,Joedna; de Assis Júnior,Raimundo Nonato; Rocha Matias,Sammy Sidney; Camacho-Tamayo,Jesús Hernán.
Soil variability occurs due to natural and anthropogenic factors acting at various spatial and temporal scales. The purpose of this study was to evaluate the spatial variability as well as the relation of some chemical attributes using different statistical techniques. The study was conducted in the municipality of Maracanaú (CE, Brazil) in the commercial area of sugar cane in a typic Hapludalf. Soils were sampled in a 100 x 100 m grid every 10 m and at a depth between 0 and 20 cm for determination of exchangeable acidity, pH (KCl), Ca, Na, K, Mg, P, N, sum of bases, cationic exchange capacity, base saturation and organic matter. Data were subjected to analysis of descriptive statistics, multivariate analysis and geostatistics. Attributes showed low and...
Tipo: Journal article
Palavras-chave: Geostatistics; Principal components; Cluster analysis.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000100015

The identification of outstanding potato cultivars using multivariate methods
Provedor de dados: 118
Autores: Pérez,Delfina de J; González,Andrés; Sahagún,Jaime; Vázquez,Luis M; Rivera,Antonio; Franco,Omar; Domínguez,Aurelio.
The evaluation and selection of potato (Solanum tuberosum) cultivars for commercial production in the high valleys of Mexico are important for plant breeding, seed production, and the generation of technology. In this work, ten potato cultivars from five different environments in México were evaluated to determine the proportion of genetic variation contained within each. The potatoes were sown in a completely randomized complete block design. Heritability was determined to be between 53% and 83%, suggesting that there is genetic variability among the potato cultivars that might be agronomically important. According to the additive main effects and multiplicative interaction (AMMI) model, the highest tuber yields were obtained at the locality named...
Tipo: Journal article
Palavras-chave: AMMI model; Cluster analysis; Principal component analysis; Solanum tuberosum.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300006

Analysis of genetic diversity in Argentinian heterotic maize populations using molecular markers
Provedor de dados: 118
Autores: Morales,Marcelo; Decker,Viviana; Ornella,Leonardo.
Over the past three decades, traditional Argentinean Orange Flint maize cultivars have been replaced by the higher yielding U.S. Yellow Dent germplasms. However, fint cultivars are potentially resistant to biotic and/or abiotic stress. Thus, knowledge of genetic diversity and relationships among fint inbred lines would help reduce genetic vulnerability and broaden the genetic base of crops in national improvement programs. In this study, we report the analysis of 25 inbred Orange Flint germplasms and one dent using 21 microsatellite markers or Simple Sequence Repeats (SSR). The aim was to assess genetic diversity among these accessions and evaluate the usefulness of SSR markers for defning heterotic groups in temperate germplasm. Genetic diversity values...
Tipo: Journal article
Palavras-chave: Cluster analysis; Microsatellite; Zea mays.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100015

An alternative method for assessing the equivalence among treatments in survival analysis
Provedor de dados: 65
Autores: Peternelli,Luiz Alexandre; Tomaz,Flávia Sílvia Corrêa; Bernardes,Diego Paiva; Silva,Gilson Fernandes da; Lacerda,Fabricia Gonçalves.
This work aims to evaluate the use of parametric models instead of a nonparametric procedure to adjust survival curves related to different treatments, and to verify the equivalence among treatments by the multivariate method of cluster analysis. The dataset used to validate the method was obtained from a laboratory experiment with cutting ants. Eight colonies of cutting ants were used, each one receiving different treatments. The exponential, Weibull, log-normal, and logistic models were adjusted for each treatment, along with the usual Kaplan-Meier adjustment. The logistic model used was the best option for evaluating the survival of the ants. Therefore, this model was adjusted for each treatment. The estimates of the parameters of each adjusted model...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Logrank test; Cluster analysis; Curves comparison.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000900004

Analysis on genetic diversity of 51 Grape germplasm resources
Provedor de dados: 65
Autores: Yue,Qingchun; Zhang,Chenfei; Wang,Qinghao; Wang,Wenjing; Wang,Jinyang; Wu,Yueyan.
ABSTRACT:  The objective of this study is to research the genetic diversity of the ‘ Zuijinxiang ’ grape and its mutant breeding F1 plants, we screened the excellent mutant plants with potential breeding value. 50 mutated single plants obtained from 137Cs-γ irradiated ‘Zuijinxiang’ grape seeds were used as research objects, and SCoT molecular marker technology was used for genetic diversity and variation analysis, and clustering research was carried out. The results showed that: (1) 36 SCoT primers produced abundant polymorphisms, and the amplification results showed obvious bright bands, and the amplification efficiency and polymorphism rate were 100%. (2) A total of 221 bands were amplified by 36 primers, of which 175 were rich in polymorphism, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grape; SCoT markers; Genetic diversity; Cluster analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001100406

Genetic divergence among Nellore breed herds raised in the South Region of Brazil
Provedor de dados: 65
Autores: Lopes,Jader Silva; Rorato,Paulo Roberto Nogara; Weber,Tomás; Araújo,Ronyere Olegário de; Everling,Dionéia Magda; Bresolin,Tiago; Dornelles,Mariana de Almeida; Breda,Fernanda Cristina.
The objective of this study was to evaluate the genetic divergence among Nellore breed animals raised in 45 farms in the Southern Region of Brazil. The characteristic studied was weaning weight adjusted to 205 days of life (P205), from 10,874 animals sired by 425 bulls and 7,629 cows, collected between 1976 and 2001, and distributed in the states of Rio Grande do Sul (1,499), Santa Catarina (2,332) and Paraná (7,043). The animals were distributed by cluster analysis in eight genetic divergent groups, enabling this technique to be applied to organize the matings in order to obtain heterotic effect. The herd/farm groups were formed through the hierarchical Ward method, using the direct (VGD) and maternal (VGM) breeding values predicted by the REML method....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Genetic diversity; Multivariate analysis; Similarity; Ward hierarchical method.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000500020

Typology of beef production systems according to bioeconomic efficiency in the south of Brazil
Provedor de dados: 65
Autores: Canozzi,Maria Eugênia Andrighetto; Marques,Pedro Rocha; Teixeira,Odilene de Souza; Pimentel,Concepta Margaret McManus; Dill,Matheus Dhein; Barcellos,Júlio Otávio Jardim.
ABSTRACT:  The objective of this study was to evaluate the bioeconomic efficiency of beef cattle production systems in the south of Brazil. A survey was conducted with 33 beef cattle farmers operating with complete cycle production systems in areas larger or equal to 900 ha. Answers were classified in two drivers, technology (TEC) and management (MAN), which were separated into subfactors with their respective components. Multiple correspondence analysis, Tukey test, cluster analysis, and Pearson correlation were the statistics procedures. The TEC components were above normal for Brazilian farmers, but the gross margin is still lower than that needed to generate financial resources for a proper remuneration of cattle farmer. Farmers were classified into...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal production; Cattle; Cluster analysis; Production cost.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001000652

Differences between urban and rural population with respect to demand on forestry aspects, in a case study of the Turkish province of Bal kesir
Provedor de dados: 65
Autores: Erol,Seçil Yurdakul.
Inhabitants of urban and rural areas are important participants in the process of developing and implementing forest policy. Thus, it is essential to determine their demands and attitudes towards forestry issues. In this context, the demands and evaluation of forest functions are investigated in a case study of the Turkish province of Bal kesir. The findings of the case study show that differences in terms of demands among inhabitants of rural and urban areas are related to forest fires fighting, crimes fighting, forestry-tourism integration, forestation and regeneration activities, and the enlargement of forest areas. The main differences among their assessments of forest functions are related to fire wood production, and the provision of flood and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forestry; People demands; Forest functions; Cluster analysis; Comparing means.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782012000300009

Consumption attributes and preferences on medicinal and aromatic plants: a consumer segmentation analysis
Provedor de dados: 65
Autores: Güney,Osman Inanç.
ABSTRACT:  In recent years, increasing interest in natural and traditional plants, which are an integral part of rural life, has been observed because of health concerns and new social trends. In this regard, medicinal and aromatic plants (MAPs) are becoming more popular among consumers. The purpose of this research is to investigate consumers’ attitudes and behaviors toward MAPs in order to identify possible distinct consumer group and examine its potential linkage to the characteristics of the consumers’ demographic and socio-economic status. To detect the perceived differences among consumers, the principal component and k-means cluster analysis were performed using the data from a face-to-face survey (n=420) conducted in five major cities in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Consumer segmentation; Cluster analysis; Medicinal and aromatic plants; Consumer behavior; Rural development.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000500930