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A Continuum of Consumer Attitudes Toward Genetically Modified Foods in the United States AgEcon
Ganiere, Pierre; Chern, Wen S.; Hahn, David E..
A national telephone survey was conducted in the United States in April 2002 to study the consumer acceptance of genetically modified (GM) foods. Attitudes toward GM foods were examined through the use of a multiple correspondence analysis (MCA), analyzing the interrelationships among many categorical variables. This method was combined with a cluster analysis to construct a typology of consumers' attitudes. Four distinct classes of attitudes were finally extracted, denoted as: Proponents, Non-Opponents, Moderate Opponents, and Extreme Opponents. It was estimated that only 35% of the surveyed population was opposed to GM foods.
Tipo: Journal Article Palavras-chave: Consumer acceptance; Correspondence analysis; GM foods; Telephone survey; Consumer/Household Economics; Research and Development/Tech Change/Emerging Technologies.
Ano: 2006 URL: http://purl.umn.edu/10148
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A neural qualitative approach for automatic territorial zoning. Repositório Alice
MACIEL, R. J. S.; SILVA, M. A. S. da; MATOS, L. N.; DOMPIERI, M. H. G..
This article presents the application of the Self-Organizing Maps (SOM) as an exploratory tool for automatic territorial zoning by combining the handle of categorical data and the other for automatic clustering. The SOM online learning algorithm had been chosen to treat categorical data by using the dot product method and the Sorense-Dice binary similarity coefficient. To automatically perform a spatial clustering, an adaptation of the automatic clustering Costa-Netto algorithm had been also proposed. The correspondence analysis had been used to examine the profiles of each homogeneous zones. To explore the approach it has been performed the territorial zoning of the Alto Taquari River Basin, Brazil, using as input data a set of thematic maps. The results...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Bacia do Alto Taquari; Zoneamento; Análise espacial; Self-organizing maps; Exploratory spatial analysis; Similarity coefficients; Alto Taquari River Basin; Correspondence analysis; Zoning; Thematic maps.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1085890
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Aérosols côtiers dans le nord de la Manche ArchiMer
Flament, P; Lepretre, A; Noel, S; Auger, Y.
Dix-huit prélèvements d'aérosols ont été effectués en Manche Nord, soit en bordure de mer, soit à quelques milles au large, à l'aide d'un impacteur à cascade (5 étages). L'ensemble des données (concentrations de 8 éléments répartis en 6 classes granulométriques successives) est exploité par analyse factorielle des correspondances. Celle-ci permet de mettre en évidence de larges déformations dans les spectres granulométriques pour les éléments traceurs marin et terrestre (Na et Al). En opposition, les métaux résultant d'activité anthropique (Fe, Pb, Zn, Mn), ont des comportements beaucoup plus typés. Parmi ceux-ci, la présence du manganèse sur le site paraît être indépendante de celle des autres métaux et imputable à une seule source. Pb, Fe, Zn et cuivre...
Tipo: Text Palavras-chave: Aérosols; Éléments-traces; Analyse par correspondance; Distribution granulométrique; Littoral; Aerosols; Trace elements; Correspondence analysis; Size distribution; Coastal.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/00110/22082/19723.pdf
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Association between responses obtained using adaptability and stability methods in alfalfa. Repositório Alice
NASCIMENTO, M.; NASCIMENTO, A. C. C.; CIRILLO, M. A.; FERREIRA, A.; PETERNELLI, L. A.; FERREIRA, R. de P..
2013
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Correspondence analysis; Genotype × environment interaction; Multiple centroid method; Eberhart and Russell (1966).
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/973556
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Automatic environmental zoning with self-organizing maps. Repositório Alice
SILVA, M. A. S. da; MACIEL, R. J. S.; MATOS, L. N.; DOMPIERI, M. H. G..
This article presents the application of the Self-Organizing Maps (SOM) as an exploratory tool for automatic environmental zoning by combining the handle of categorical data and the other for automatic clustering. The SOM online learning algorithm had been chosen to treat categorical data by using the dot product method and the Sorense-Dice binary similarity coefficient. To automatically perform a spatial clustering, an adaptation of the automatic clustering Costa-Netto algorithm had been also proposed. The correspondence analysis had been used to examine the profiles of each homogeneous zones. To explore the approach it has been performed the environmental zoning of the Alto Taquari River Basin, Brazil, using as input data a set of thematic maps. The...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Artificial neural network; Exploratory spatial analysis; Similarity coefficients; Alto Taquari river; Correspondence analysis.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1103941
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Epidemiological characterization and risk evaluation associated with the presence of Megninia spp. in posture farms Ciência Rural
Oliveira,Tiago Mendonça de; Teixeira,Cristina Mara; Arcebispo,Thiago Luiz Mendes; Antunes,Karla Dias; Rezende,Leandro do Carmo; Cunha,Lucas Maciel; Diniz,Soraia de Araújo; Silva,Marcos Xavier.
ABSTRACT: This study was accomplished with the aim to evaluate and to characterize the risks for the presence of Megninia spp. in poultry farms from Minas Gerais, using for that Correspondence Analysis (CA). A secondary database was used and adapted for this study, with information from 402 chicken houses of 42 laying hens commercial properties. Variables used to compose the correspondence model were selected through tests of Qui-square being considered the significant result of P≤0,05. A risk index was built to the presence of Megninia spp. starting from variables considered as risk factors for the presence of those ectoparasites. The CA graph produced for the epidemiological characterization of the presence of Megninia spp. presented an accumulated...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Megninia spp.; Risk index; Correspondence analysis.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000900501
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Epidemiological characterization and risk evaluation associated with the presence of Phthiraptera in poultry farms from Minas Gerais, Brazil Biological Sciences
Oliveira, Tiago Mendonça de; Teixeira, Cristina Mara; Pinto, Mariana Olímpia Köhler Marra; Arcebispo, Thiago Luiz Mendes; Soriano-Araújo, Amanda; Cunha, Lucas Maciel; Diniz, Soraia Araújo; Silva, Marcos Xavier.
Phthiraptera are lice highly adapted to living as permanent and obligatory ectoparasites of birds and mammals. High infestations by biting lice contribute to the low productivity, loss quality of the eggs, besides weight decrease of chickens. Therefore, this study aimed to evaluate and to characterize the risks involved with the presence of biting lice in laying chicken from Minas Gerais, Brazil, throught a Multiple Correspondence Analysis (MCA). A secondary database with information regarding 402 chicken houses from 42 properties of laying hens from the same region was used and adapted for this study. The variables that composed the correspondence model were selected through Chi-square tests (p ≤ 0.05). A risk index was designed to relate the presence of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Epidemiology; Lice; Laying hens; Risk index; Correspondence analysis.
Ano: 2019 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/47474
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Espacialização da homogeneidade e heterogeneidade do meio biofísico para planejamento ambiental utilizando análise multivariada. Repositório Alice
SILVA, J. dos S. V. da; CARVALHO, J. R. P.; SANTOS, R. F. dos; FILGUEIRAS, C. A..
Esta pesquisa objetiva identificar e mapear zonas "homogêneas" no meio biofísico a partir da seleção de atributos ambientais que possam ser mapeados, medidos e relacionados numa base de dados em Sistema de Informação Geográficas (SIG), associada a técnicas de análise multivariada. O estudo de caso foi a bacia hidrográfica do alto do rio Taquari (MS/MT) com 28.046 km2.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Análise de correspondência; Zoneamento ecológico-econômico; Análise de agrupamento; Zoneamento ambiental; Environmental zoning; Ecological-economic zoning; Sistema de Informação Geográfica; Zoning; Multivariate analysis; Correspondence analysis; Geographic information systems; Cluster analysis.
Ano: 2006 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1359
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ESTRUTURA DO MERCADO DE TRABALHO AGRÍCOLA NO BRASIL: UMA ANALISE DESCRITIVA DA EVOLUÇÃO DE SUAS CATEGORIAS ENTRE 1995 E 2006 AgEcon
Neder, Henrique Dantas.
Este trabalho teve como principal objetivo analisar a estrutura ocupacional relacionada às atividades agropecuárias do Brasil, dando especial destaque as atividades não remuneradas. Foi observado que no período 1995 a 2006 ocorreu uma significativa elevação da participação relativa dos trabalhadores na produção para o próprio consumo na composição dos ocupados em atividades agropecuárias. O trabalho concentrou-se na caracterização das formas não remuneradas de trabalho agrícola. Identificou-se que praticamente 30% do esforço ocupacional (medido em termos de quantidade de horas acumuladas de trabalho) em atividades da agropecuária estão concentrados em formas ocupacionais não remuneradas. Alem disto vem se observando uma redução do numero médio de horas...
Tipo: Conference Paper or Presentation Palavras-chave: Mercado de trabalho agrícola; Análise de correspondências; PNAD; Ocupações agrícolas; Produção agrícola familiar; Farm work market; Correspondence analysis; Production of agricultural families; Labor and Human Capital.
Ano: 2008 URL: http://purl.umn.edu/113179
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Exploring consumers’ knowledge and perceptions of unconventional food plants: case study of addition of Pereskia aculeata Miller to ice cream Ciênc. Tecnol. Aliment.
MAZON,Suelen; MENIN,Daiana; CELLA,Bruna Marina; LISE,Carla Cristina; VARGAS,Thiago de Oliveira; DALTOÉ,Marina Leite Mitterer.
Abstract Unconventional food plants (UFPs) are by definition little known and infrequently consumed by population, although are recognized as having high nutritional value and economic potential. The objective was to assess the knowledge about UFPs by the population in the southwestern region of the state of Paraná, Brazil; and more particularly to evaluate the holistic perception of an ice cream prepared with the UFP ora-pro-nóbis, a plant that is gaining attention in recent years We applied a questionnaire to assess knowledge of several UFPs; check-all-that-apply questions to evaluate the knowledge, habits and perceptions regarding UFPs; and word association (WA) and acceptance tests for holistic and hedonic evaluation of the ice cream. The results...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Check-all-that-apply; Correspondence analysis; Ora-pro-nóbis; Word association.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612020000100215
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From seasonal patterns to a reference situation in an estuarine environment: Example of the small fish and shrimp fauna of the Gironde estuary (SW France) ArchiMer
Lobry, Jeremy; Lepage, Mario; Rochard, Eric.
Detecting changes in animal communities suggests that a reference situation exists. It is a particularly difficult task in estuarine environments that are complex and fluctuate with time. Effects of human pressures are difficult to assess due to the scarcity or even the lack of evaluation and monitoring systems. In order to detect anomalies in the functioning of the system and to identify effects of perturbations upon populations and communities, it is necessary to analyse the dynamics in order to infer a reference state. This work aims to describe an approach based on K-Tab analyses and allows to define an average situation called "compromise" which is then compared to a single year of data. In this situation, the Gironde estuary, which has been monitored...
Tipo: Text Palavras-chave: Fish and shrimp assemblages dynamics; Gironde estuary; Correspondence analysis; Spatial pattern; STATIS.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1989.pdf
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Intensive rearing of juvenile oysters Crassostrea gigas in an upwelling system : optimization of biological production ArchiMer
Bacher, Cedric; Baud, Jean-pierre.
Seasonal growth of juvenile oysters (Crassostrea gigas) kept in an intensive upwelling system was studied from 1984 to 1986 in 60 to 90-day growth experiments. Saline ground water was used to produce Skeletonema costatum which was injected as food into the water supplying the upwelling system. Oyster density, water flow, phytoplankton concentration, temperature and frequency of food addition were controlled. Oyster growth was analysed with multidimensional contingency tables and correspondence analysis. The factors, in order of decreasing influence on growth, were temperature, food concentration and oyster density. A rearing strategy was deduced from the growth analysis for summer and winter. In summer, the density of 120,000 oysters/m2, the flow rate of...
Tipo: Text Palavras-chave: Nursery; Growth; Correspondence analysis; Multidimensional contingency table analysis; Economic efficiency; Skeletonema costatum; Crassotrea gigas; Nourriture; Croissance; Analyse des correspondances; Table de contingence multidimensionnelle; Rentabilité économique; Skeletonema costatum; Crassostrea gigas.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/publication-3061.pdf
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Stability of spatial structures of demersal assemblages: a multitable approach ArchiMer
Gaertner, Jean-claude; Chessel, Daniel; Bertrand, Jacques.
The present work is based on a set of bottom trawl surveys performed in the Gulf of Lions between 1983 and 1992. A new method which couples the STATIS multitable approach with the logic of correspondence analysis (CoA) is proposed to study the stability of spatial organization of demersal assemblages in terms of species composition. This CoA version of STATIS has provided a clear representation of the stable part of the spatial structure of the assemblages. In addition, it gave an insight into the interannual variations of the distribution of each population around the reference structure. Our results showed that the demersal assemblages of the Gulf of Lions exhibited strong spatial structuring, mainly orientated along a bathymetric gradient. This gradient...
Tipo: Text Palavras-chave: Assemblage de poissons; Chalutage; Analyse multitableaux; Méditerranée; Stabilité; Structure spatiale; Fish assemblage; Trawl surveys; Multitable analysis; Correspondence analysis; Mediterranean sea; Stability; Spatial structure.
Ano: 1998 URL: https://archimer.ifremer.fr/doc/1998/publication-875.pdf
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Succession saisonnière des populations phytoplanctoniques des eaux côtières de la Manche ArchiMer
Ryckaert, Mireille; Gros, Philippe; Erard-le Denn, Evelyne.
Quantitative microphytoplankton samples were collected from shallow-water coastal stations in Channel between 1976 and 1980. The aim of the study is to describe the seasonal succession of the populations with respect to some physico-chemical parameters, i. e. to relatate the distribution of abundance to hydrographic seasons. We build a contigency table (species x environmental variables, both under disjunctive coding), which is described by correspondence analysis (reciprocal averaging). The results show the main features of the annual changes in the community dominated by diatoms
Tipo: Text Palavras-chave: Microphytoplancton côtier; Successions saisonnières; Analyse des correspondances; Coastal microphytoplankton; Seasonal successions; Correspondence analysis.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/00139/25075/23180.pdf
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Zoneamentos ambientais: quando uma unidade territorial pode ser considerada homogênea? Repositório Alice
SILVA, J. dos S. V. da; CARVALHO, J. R. P.; SANTOS, R. F. dos; FELGUEIRAS, C. A..
Em zoneamento ambiental delimitam-se unidades territoriais que, para definição de diretrizes, são consideradas homogêneas. No entanto, reconhece-se que há uma variabilidade interna não representada em mapa, particular a cada uma delas, seja na composição, arranjo ou função ambiental. Este estudo tem como objetivo apresentar uma estratégia metodológica para obtenção das zonas a partir da integração de dados ambientais espacializados com informações quantitativas sobre as relações espaciais entre esses dados, de forma a determinar o grau de homogeneidade da área amostra. Foi usada uma base de dados em Sistema de Informações Geográficas, associada a técnicas de análise de agrupamento hierárquico de Ward e análise de correspondência. O estudo de caso foi a...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Análise de correspondência; Análise de agrupamento; Heterogeneidade ambiental; Zoneamento ambiental; Paisagem; Environmental heterogeneity; Environmental zoning; Correspondence analysis; Cluster analysis; Landscapes.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1667
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