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Registros recuperados: 73
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A comparative analysis of the technical efficiency of rain-fed and smallholder irrigation in Ethiopia AgEcon
Makombe, Godswill; Namara, Regassa E.; Hagos, Fitsum; Awulachew, Seleshi Bekele; Ayana, Mekonnen; Bossio, Deborah A..
Agriculture is the most significant contributor to Ethiopia’s economy. Most of the agricultural production is under rainfed conditions and thus extremely sensitive to rainfall variability. Irrigation development, including smallholder irrigation, is used by the Ethiopian Government to attempt to mitigate the effects of rainfall variability. In this study, we look at smallholder irrigation - modern and traditional irrigation systems. A detailed description of the cropping patterns is given. The stochastic frontier production function approach is used to estimate technical inefficiency, and constraints to production are analyzed. Since the traditional system is found to be efficient but on a lower production frontier, the study shows that significant gains...
Tipo: Working or Discussion Paper Palavras-chave: Rainfed farming; Irrigated farming; Efficiency; Irrigation schemes; Small scale systems; Cropping patterns; Crop production; Economic aspects; Statistical analysis; Crop Production/Industries; Farm Management.
Ano: 2011 URL: http://purl.umn.edu/113012
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A comparative analysis of the technical efficiency of rain-fed and smallholder irrigation in Ethiopia AgEcon
Makambe, Godswill; Namara, Regassa E.; Hagos, Fitsum; Awulachew, Seleshi Bekele; Ayana, Mekonnen; Bossio, Deborah A..
Agriculture is the most significant contributor to Ethiopia’s economy. Most of the agricultural production is under rainfed conditions and thus extremely sensitive to rainfall variability. Irrigation development, including smallholder irrigation, is used by the Ethiopian Government to attempt to mitigate the effects of rainfall variability. In this study, we look at smallholder irrigation - modern and traditional irrigation systems. A detailed description of the cropping patterns is given. The stochastic frontier production function approach is used to estimate technical inefficiency, and constraints to production are analyzed. Since the traditional system is found to be efficient but on a lower production frontier, the study shows that significant gains...
Tipo: Working or Discussion Paper Palavras-chave: Rainfed farming; Irrigated farming; Efficiency; Irrigation schemes; Small scale systems; Cropping patterns; Crop production; Economic aspects; Statistical analysis; Agricultural and Food Policy; Crop Production/Industries; Production Economics.
Ano: 2011 URL: http://purl.umn.edu/118298
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A Comparison Of Characteristics Of Forest and Farm Cooperative Members AgEcon
Berlin, Christina; Erikson, Ljusk Ola.
The forest owner cooperatives in Sweden were established almost a century ago with the aim to improve the private forest owners’ bargaining situation and improve silviculture (the study, cultivation, and management of forest trees). The characteristics of today’s private forest owners and forest industry are changing, something which should encourage the forest owner cooperatives to consider adaptations of their organizations. The aims of this paper are, first, to describe characteristics of forest owner cooperative members and second, to probe the applicability of farm cooperative research in this venture. The statements that are tested are based on characteristics established in farm cooperative research and refer to (i) a negative relation between...
Tipo: Journal Article Palavras-chave: Private forest owners; Cooperative theory; Statistical analysis; Member’s age; Property size; Transaction; Agribusiness.
Ano: 2007 URL: http://purl.umn.edu/46580
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A generator of a web map of biological interactions for rice invertebrates International Rice Research Institute
Zhang, W. J.; Wu, H. X.; Qi, Y. H..
p.45-47
Palavras-chave: Invertebrates; Internet; Computer software; Statistical analysis.
Ano: 2004 URL: http://hdl.handle.net/123456789/1036
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A study on statistical analysis of data from intercropping experiments International Rice Research Institute
Rahim, Kamal.
138 l. Thesis (Ph.D.) -- University of the Philippines
Tipo: Thesis Palavras-chave: Intercropping; Field experimentation; Data analysis; Statistical analysis; Rice; Legumes; Cropping systems.
Ano: 1988 URL: http://hdl.handle.net/123456789/1199
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A VIDÉKI TURIZMUS SZEREPE AZ ÉSZAK-MAGYARORSZÁG RÉGIÓBAN, KÜLÖNÖS TEKINTETTEL A VIDÉKFEJLESZTÉSRE A 2007-13. ÉVI AGRÁR- ÉS VIDÉKPOLITIKA TÜKRÉBEN AgEcon
David, Lorant; Toth, Geza; Kelemen, Nora; Kincses, Aron.
Észak-Magyarország három megyéje közül Borsod-Abaúj-Zemplén megyé-ben a legjelentősebb a magánszállásadás szerepe, a vendéglátók 50,5%-a találha-tó itt, Hevesben 41,6%-a, miközben Nógrád megyében 7,9%-a. Észak-Magyarország magánszállás férőhelyeinek eloszlása a 2005-ös adatokat vizsgálva területileg meglehetősen egyenlőtlen. A magánszálláshelyeken belül a 2005-ös adatok alapján a falusi szállásadás szálláshelyei 58%-ot tesznek ki, mellyel a régió eltér az országos megoszlástól. A legtöbb mutató vonatkozásában megállapítottuk, hogy a régió megyéinek falusi szállásadással, illetve magánszállásadással rendelkező települései társadalmi-gazdasági fejlettsége, illetve folyamatai sok tekintetben kedvezőtlenebbek az ilyen szállásadással rendelkező települések...
Tipo: Journal Article Palavras-chave: Vidéki turizmus; Falusi szállásadás; Fizetővendéglátás; Statisztikai elemzés; Versenyképesség; Countryside tourism; Village accommodation; Commercial hospitality; Statistical analysis; Competitiveness; Agricultural and Food Policy; Community/Rural/Urban Development.
Ano: 2007 URL: http://purl.umn.edu/57687
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Accident at work with fertilizer distributors in Austrian agriculture CIGR Journal
Kogler, Robert; Quendler, Elisabeth; Boxberger, Josef.
Accidents with fertilizer distributors at work happen in the Austrian agriculture every year.  In accordance with Machinery Directive 2006/42/EC and the standards ISO 4254-1 and DIN EN 14017, fertilizer distributors undergo a risk assessment before construction and market entry to ensure their complying with these legal recommendations and to eliminate largely the risk of injury for the operators.  To determine the accident scenarios, causes, and technical solutions, a narrative analysis of 14 reports of accidents that led to moderate and serious injuries from 2008 to 2010 was done, eight victims interviewed, and seven accident machines and eight new ones, which were sold in 2013, evaluated according to applicable regulations.  Mostly farm managers were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Work safety; Ergonomics Agricultural machinery; Fertilizer distributors; Accident analysis; Statistical analysis.
Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2941
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An Evaluation of the Use of Statistical Procedures in Soil Science Rev. Bras. Ciênc. Solo
Tavares,Laene de Fátima; Carvalho,André Mundstock Xavier de; Machado,Lucas Gonçalves.
ABSTRACT Experimental statistical procedures used in almost all scientific papers are fundamental for clearer interpretation of the results of experiments conducted in agrarian sciences. However, incorrect use of these procedures can lead the researcher to incorrect or incomplete conclusions. Therefore, the aim of this study was to evaluate the characteristics of the experiments and quality of the use of statistical procedures in soil science in order to promote better use of statistical procedures. For that purpose, 200 articles, published between 2010 and 2014, involving only experimentation and studies by sampling in the soil areas of fertility, chemistry, physics, biology, use and management were randomly selected. A questionnaire containing 28...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Statistical analysis; Means test; Misuse of statistics.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100307
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Análise de agrupamento de dados de expressão gênica na Rede Genômica Animal. Infoteca-e
HIGA, R. H.; GIACHETTO, P. F.; YAMAGISHI, M. E. B.; IBELLI, A. M. G.; REGITANO, L. C. de A.; CARDOSO, F. F..
O objetivo deste trabalho é apresentar a análise de agrupamento de dados de expressão gênica, conforme realizada no escopo da ?Rede Genômica Animal?. Na seção 2, são apresentados conceitos básicos sobre análises de agrupamento. Em particular, os algoritmos de agrupamento utilizados nessas análises compreendem aqueles mais conhecidos, como k-means, SOM e agrupamento hierárquico. A plataforma de análise escolhida para realização das análises de agrupamento na ?Rede Genômica Animal? é o ambiente de análise estatística R (R DEVELOPMENT CORE TEAM, 2010) e o projeto Bioconductor (GENTLEMAN et al., 2004). Assim, na seção 3 é apresentado um exemplo completo de análise de agrupamento e seu respectivo script R.
Tipo: Comunicado Técnico (INFOTECA-E) Palavras-chave: Agrupamento de dados; Expressão gênica; Rede Genômica Animal; Análise de componentes principais - PCA.; Análise Estatística.; Gene expression; Algorithms; Statistical analysis; Principal component analysis.
Ano: 2010 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/883623
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Analise de experimentos com dados repetidos ao longo do tempo ou espaco. Infoteca-e
VIVALDI, L. J..
Em uma grande parte dos experimentos uma variavel resposta e observada ao longo do tempo, do espaco ou de ambos; a analise de cada resposta, isoladamente, e ineficiente pois nao leva em consideracao seu comportamento no tempo ou no espaco e as implicacoes dai advindas. Na analise multivariada, ignora-se que exista uma sequencia no tempo ou no espaco e os testes de significancia sao menos sensiveis do que os proprios da anaalise univariada. Dentro deste contexto, buscam-se procedimentos corretos para a analise de variancia univariada de experimentos que considerem o tempo e o espaco como fatores. As dificuldades de se tomar o tempo e o espaco como fatores ocorrem, porque eles nao sao casualizados, ao contrario dos tratamentos aplicados as unidades...
Tipo: Documentos (INFOTECA-E) Palavras-chave: Análise multivariada; Brasil; Delineamento; Estatístico; Experimento; Modelo estatístico; Statistical methods; Statistics models.; Estatística; Método; Método Estatístico.; Brazil; Statistics.; Statistical analysis.
Ano: 1999 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/555301
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Análisis de clasificación de series temporales: el caso de la salinidad en la Ciénaga Grande de Santa Marta OceanDocs
Giraldo-H., R.; Martínez-C., J.; Hurtado-T., L.H.; Zea, S.; Madera-R., E.R..
Se realizó una clasificación numérica de 21 estaciones de monitoreo del sistema laguno -estuarino comprendido por la Ciénaga Grande de Santa Marta y el Complejo Pajarales, de acuerdo a su similaridad en el comportamiento de la salinidad del agua. Se utilizó información quincenal comprendida entre enero de 1987 y octubre de 1991. Debido a la estructura de autocorrelación de los datos fue necesario emplear los modelos ARIMA de series de tiempo en primer lugar, y posteriormente aplicar una técnica de clasificación normal con los coeficientes de la representación infinita AR calculados para cada estación. Los resultados del análisis fueron coherentes con las hipótesis planteadas acerca de la distribución de la variable en el sistema.
Tipo: Journal Contribution Palavras-chave: Ecology; Salinity effects; Autocorrelation; Monitoring; Coastal lagoons; Estuaries; Statistical analysis; Ecology; Monitoring; Estuaries; Statistical analysis; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_4911; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_7378; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 1995 URL: http://hdl.handle.net/1834/3813
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Analyse de la variabilité spatio-temporelle des populations phytoplanctoniques observées dans le réseau national de surveillance du phytoplancton dans le golfe de Gabés OceanDocs
Feki-Sahnoun, W..
Le long des côtes du golfe de Gabès, les données collectées dans le cadre du Réseau de Surveillance du Phytoplancton et des Phycotoxines (REPHY), constituent une base pertinente pour examiner la structure et la dynamique des communautés phytoplanctoniques à grandes échelles temporelle (1997-2007) et géographique (l’ensemble de littoral du golfe). S’appuyant sur les données du REPHY, l’objectif de cette étude était de décrire les principales formes de variabilité des communautés phytoplanctoniques observées sur nos côtes. Les schémas de la variabilité des populations phytoplanctoniques ont été examinés à différentes échelles temporelles et géographiques à l’aide de méthodes statistiques multivariées. Dans un premier temps, l’analyse de la dynamique des...
Tipo: Theses and Dissertations Palavras-chave: Phytoplankton; Temporal variations; Geographical distribution; Statistical analysis; Models.
Ano: 2013 URL: http://hdl.handle.net/1834/5444
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Analyse de l'évolution temporelle de communautés macrobenthiques à partir des probabilités de présence des espèces ArchiMer
Mante, C; Durbec, Jp; Dauvin, Jc.
Statistical analysis of long-term changes in marine communities generally involves recourse to multivariate methods. Some of these, such as Correspondence Analysis (CA), are very sensitive to the presence of rare species in the data, whereas other methods, such as Principal Components analysis (PCA) or Multidimensional Scaling (MDS) are only sensitive to the dominant species. Thus, it is necessary to identify rare species. We used an original method of species determination, based on a multinomial scheme and permitting the generalization of the classical presence/absence coding from a probabilistic viewpoint. This selection method was applied to the identification of the different categories of species (rare, intermediate or dominant) that constitute the...
Tipo: Text Palavras-chave: Statistical analysis; Probability; Long-term changes; Macrobenthic community.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00093/20428/18095.pdf
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Analysis of activities of farm households in a commune in Vietnam using multivariate statistical techniques International Rice Research Institute
Le Thi Chau Dung.
206 leaves : ill. Thesis (M.S.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Rice; Farmers; Households; Rural communities; Economic analysis; Multivariate analysis; Statistical analysis; Vietnam.
Ano: 1993 URL: http://hdl.handle.net/123456789/737
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Analyzing one-way experiments: a piece of cake of a pain in the neck? Scientia Agricola
Kozak,Marcin.
Statistics may be intricate. In practical data analysis many researchers stick to the most common methods, not even trying to find out whether these methods are appropriate for their data and whether other methods might be more useful. In this paper I attempt to show that when analyzing even simple one-way factorial experiments, a lot of issues need to be considered. A classical method to analyze such data is the analysis of variance, quite likely the most often used statistical method in agricultural, biological, ecological and environmental studies. I suspect this is why this method is quite often applied inappropriately: since the method is that common, it does not require too much consideration-this is how some may think. An incorrect analysis may...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Analysis of variance; Assumptions; Graphical statistics; Multiple comparisons; Normal distribution; Non-parametric statistics; One-way designs; Statistical analysis.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400020
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Aplicación estadística en los bioensayos de toxicidad con sedimentos extraído del Estero Salado, canal de acceso al Puerto Marítimo de Guayaquil OceanDocs
Villamar, F..
With the purpose of proving and determining in a short term the impact of the dredged material that can be caused by the organisms that inhabit the marine-estuary ecosystem, was performed toxicity bioassay of the sediment extracted from the bottom of the Salado Estuary. This sediment obstructs the access channels of the Marítime Port of Guayaquil. For this bioassay, was used white shrimp larvae of the species Litopenaeus vannamei, a commercially important organism that depends for its food on the organic detritus coming from the sediment and the column of estuary water in the studied area. The results obtained were analyzed applying the graphic arithmetic method and statistical analysis, through which it was determined that there is a direct relation...
Tipo: Journal Contribution Palavras-chave: Bioassays; Toxicity; Marine organisms; Sediments; Statistical analysis; Kurtosis; Dredged samples; Bioassays; Toxicity; Statistical analysis; Http://aims.fao.org/aos/agrovoc/c_15731; Http://aims.fao.org/aos/agrovoc/c_7826; Http://aims.fao.org/aos/agrovoc/c_7378.
Ano: 2002 URL: http://hdl.handle.net/1834/2257
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Applying a non-parametric bootstrap technique to assess the accuracy of biomass estimates of argentine anchovy (Engraulis anchoita) northern stock (34º S-41º S) with the Daily Egg Production Method. 1993-2008 period OceanDocs
Pájaro, M.; Hansen, J.E.; Leonarduzzi, E..
Engraulis anchoita northern stock reproductive biomass (SSB) during the 1993-2008 period was estimated applying the Daily Egg Production Method (DEPM) and accuracy of estimates assessed using a bootstrap technique (SW Atlantic Ocean, Argentine Sea). The basic data were collected in different research surveys carried out in late Spring, at the peak of the spawning season. The aim of this work was to build reliable confidence intervals around the estimates of the mean reproductive biomass applying a non-parametric bootstrap method. Resampling methods are becoming increasingly popular as statistical tools as they are robust and do not require the assumption of any particular distribution of the basic data. This is especially relevant when assessing the DEPM...
Tipo: Journal Contribution Palavras-chave: Spawning; Stocks; Fecundity; Biomass; Statistical analysis.
Ano: 2013 URL: http://hdl.handle.net/1834/5494
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Biometric and statistical investigations on the cnidoma of the genus Hydra (Cnidaria, Hydrozoa) Iheringia, Sér. Zool.
Deserti,Maria I.; Zamponi,Mauricio O..
This paper deals about the nematocysts like a source of biometric information for comparison between the species Hydra vulgaris Pallas, 1766, Hydra vulgaris pedunculata Deserti et al., 2011 and Hydra pseudoligactis (Hyman, 1931). This biometric tool lets us carry out statistical comparisons and adding these results to the identification of specimens from different classificatory groups. In this particular study, we obtained significant differences between species, individuals of each species and nematocysts type when compared the biometry of its nematocysts. Another result was the variation in of particular nematocysts, like atrichous isorhiza and holotrichous isorhiza for the species H. vulgaris in relation to the column size.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nematocysts; Biometry; Statistical analysis.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000300008
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Borrachas naturais brasileiras II. Borrachas fracas; borrachas de H. benthamiana e H. guianensis. Infoteca-e
WISNIEWSKI, A.; MELO, C. F. M. de.
bitstream/item/59516/1/Miscelanea-7.pdf
Tipo: Séries anteriores (INFOTECA-E) Palavras-chave: Borracha natural; Análise socio-economica; Borracha fraca; Propriedade; Hevea benthamiana; Hevea guianensis; Belém; Manaus; Pará; Amazonas; Brasil; Natural rubber; Socioeconomic analysis; Weak rubber; Property.; Análise Estatística; Hevea Brasiliensis; Tecnologia.; Technology.; Statistical analysis.
Ano: 1981 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/379779
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Bulletin des statistiques de pêche en ZEE de la République Islamique de Mauritanie en 1987 OceanDocs
Foucher, E.; Damiano, A..
Ce Bulletin préparé par Alain Damiano, Eric Foucher et l'ensemble du personnel du Service Statistique du CNROP présente les statistiques de pêche pour l'année 1987
Tipo: Other Palavras-chave: Collecte de données; Description des pêcheries; Effort de pêche; Flottille de pêche; Traitement des données; Statistiques des pêches; Statistical analysis; Statistical sampling; Statistical analysis; Http://aims.fao.org/aos/agrovoc/c_7378.
Ano: 1989 URL: http://hdl.handle.net/1834/1095
Registros recuperados: 73
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