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An Appraisal of Beekeeping Activities among Beneficiaries and Non-Beneficiaries of Ekiti State Agricultural Credit Agency (ESACA) Scheme in Nigeria AgEcon
Fakayode, S.B.; Babatunde, Raphael O.; Olowogbon, S.T.; Adesuyi, W.S..
The study examined beekeeping activities in Ekiti State, Nigeria. Specifically the study appraised the costs and returns structure of beekeeping activities by beneficiaries of the ESACA scheme, examined the constraints to beekeeping under the scheme and outside the scheme and identified factors that affect beekeeping under the scheme and outside the scheme. A total of 150 beekeeper households were selected; 75 households each for ESACA beneficiary and non-beneficiary respondents across communities popularly known for beekeeping in Ekiti state. Descriptive statistics, costs and returns, regression and Kruscalwallis analyses were employed for data analysis. Beekeeping was found to be more profitable under the ESACA scheme than outside the scheme with returns...
Tipo: Conference Paper or Presentation Palavras-chave: Kruscal-wallis; Costs and returns structure; Regression; Technical assistance; Crop Production/Industries; Livestock Production/Industries.
Ano: 2010 URL: http://purl.umn.edu/95785
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Assessing the determinants of rural income dispersion in Brazil. Repositório Alice
SOUZA, G. da S. e; GOMES, E. G.; ALVES, E. R. de A..
This article has as its objective the analysis of rural income dispersion in Brazil. To this en we fit econometric regression models using the Gini index as the dependent variable, tecnology, and environmental, social and demographic indices as independent variables. The analysis is performed on a regional basis. The statistical approach uses fractional regression and generalized method of moments 9GMM) The tecnological variable crystallizes the production process uses county data collected from the Brazilian agricultural census of 2006. Tecnology is significant and dominates the relationship in all regions. The other covariates vary in regional intensity.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Income concentration; Agriculture; Regression; GMM; Pesquisa agrícola.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1035777
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Biomass and grain yield of oats by growth regulator AGRIAMBI
Marolli,Anderson; Silva,José A. G. da; Romitti,Marcos V.; Mantai,Rubia D.; Hawerroth,Maraisa C.; Scremin,Osmar B..
ABSTRACT The use of growth regulator in oats can reduce plant lodging with reflections in biomass and grain yield. The objective of the study was to determine the feasibility and efficiency of using Trinexapac-Ethyl regulator in the growth of white oat under different conditions of N-fertilizer and years favorable and unfavorable for cultivation. In this study, two experiments were conducted in the years 2011, 2012 and 2013, one for quantifying biomass production rate and the other for the determination of grain yield and lodging. The experimental design was randomized blocks with four replicates, in a 4 x 3 factorial scheme, for growth regulator doses (0, 200, 400 and 600 mL ha-1) and nitrogen doses (30, 90 and 150 kg ha-1), respectively. There is a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Avena sativa; Trinexapac-ethyl; Lodging; Nitrogen; Regression.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000300163
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Causal inference with observational data AgEcon
Nichols, Austin.
Problems with inferring causal relationships from nonexperimental data are briefly reviewed, and four broad classes of methods designed to allow estimation of and inference about causal parameters are described: panel regression, matching or reweighting, instrumental variables, and regression discontinuity. Practical examples are offered, and discussion focuses on checking required assumptions to the extent possible.
Tipo: Article Palavras-chave: Xtreg; Psmatch2; Nnmatch; Ivreg; Ivreg2; Ivregress; Rd; Lpoly; Xtoverid; Ranktest; Causal inference; Match; Matching; Reweighting; Propensity score; Panel; Instrumental variables; Excluded instrument; Weak identification; Regression; Discontinuity; Local polynomial; Research Methods/ Statistical Methods.
Ano: 2007 URL: http://purl.umn.edu/119292
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Characterization and influence of production factors on growing and finishing pig farms in Brazilian cooperatives R. Bras. Zootec.
Silva,Caio Abércio da; Agostini,Piero da Silva; Dias,Cleandro Pazinato; Callegari,Marco Aurélio; Santos,Rita de Kássia Silva dos; Novais,Aliny Kétilim; Pierozan,Carlos Rodolfo; Gasó,Josep Gasa.
ABSTRACT The objective of this study was to identify and quantify, through mathematical models, the main factors of production in growing and finishing pig units linked to three Brazilian cooperatives located in Western Region of Paraná State that influence the parameters of daily feed intake and feed conversion ratio. The records of 216 growing and finishing farms from 2010 to 2013, representing 1,533 batches, and totaling approximately 1,025,000 pigs, were evaluated. Thirty production factors related to the management, health, installations and equipment, nutrition, genetics, and environment were considered. The number of pigs per pen, the feeder model, the origin and sex of the animals, and the initial and final body weights were the factors included in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Facilities; Fattening; Intake; Production indexes; Regression.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000300264
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Choosing an appropriate real-life measure of effect size: the case of a continuous predictor and a binary outcome AgEcon
Conroy, Ronan M..
A case study of data on age and pregnancy is used to point up some morals for practicing data analysts, including the superiority of regression over t tests, exploratory scatterplot smoothing as a key method of checking form of relationship, and the value of logistic regression followed by adjust as a way of getting at the numbers of most interest.
Tipo: Journal Article Palavras-chave: Adjust; Correlation; Logistic regression; Regression; Scatterplot smoothing; T tests; Research Methods/ Statistical Methods.
Ano: 2002 URL: http://purl.umn.edu/116011
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Combined index of genomic prediction methods applied to productivity traits in rice. Repositório Alice
SUELA, M. M.; LIMA, L. P.; AZEVEDO, C. F.; RESENDE, M. D. V. de; NASCIMENTO, M.; SILVA, F. F. e.
A cultura do arroz tem grande importância nacional e mundial por ser um dos cereais mais produzidos e consumidos no mundo, caracterizando-se como o principal alimento de mais da metade da população mundial. Em função de sua importância alimentar, desenvolver métodos eficientes que visam a predição e a seleção de indivíduos geneticamente superiores, quanto a características da planta, é de extrema importância para os programas de melhoramento. Diante disso, o objetivo deste trabalho foi avaliar e comparar a eficiência do método Delta-p, G-BLUP, BayesCpi, BLASSO e o índice Delta-p/G-BLUP, índice Delta-p/BayesCpi e índice Delta-p/BLASSO, na estimação de valores genômicos e dos efeitos de marcadores SNPs (Single Nucleotide Polymorphisms) em dados fenotípicos...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Predição genômica; Ganho genético; Genomic prediction; Genetic gain; Bayesian alphabet; Molecular bases; Regression; Índice de Seleção; Selection index.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1110881
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Common factors method to predict the carcass composition tissue in kid goats R. Bras. Zootec.
Gomes,Helen Fernanda Barros; Gonçalves,Heraldo Cesar; Polizel Neto,Angelo; Cañizares,Gil Ignacio Lara; Roça,Roberto de Oliveira; Marques,Raquel Ornelas; Oliveira,Giuliana Micai de; Queiroz,Edicarlos Oliveira.
The objective of this work was to analyze the interrelations among weights and carcass measures of the longissimus lumborum muscle thickness and area, and of sternum tissue thickness, measured directly on carcass and by ultrasound scan. Measures were taken on live animals and after slaughter to develop models of multiple linear regression, to estimate the composition of shoulder blade, from selected variables in 89 kids of both genders and five breed groups, raised in feedlot system. The variables considered relevant and not redundant on the information they carry, for the common factor analysis, were used in the carcass composition estimate development models. The presuppositions of linear regression models relative to residues were evaluated, the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Co-linearity; Correlation; Evaluation; Goat; Regression.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000300007
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Creating print-ready tables in Stata AgEcon
Lokshin, Michael; Sajaia, Zurab.
This article describes the new Stata command xml_tab, which outputs the results of estimation commands and Stata matrices directly into tables in XML format. The XML files can be opened with Microsoft Excel or OpenOffice Calc, or they can be linked with Microsoft Word files. By using XML, xml_tab allows Stata users to apply a rich set of formatting options to the elements of output tables.
Tipo: Article Palavras-chave: Xml_tab; Estimates; Regression; Matrices; Xml; Excel; Word; Research Methods/ Statistical Methods.
Ano: 2008 URL: http://purl.umn.edu/122600
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Crop area estimate from original and simulated spatial resolution data and landscape metrics Scientia Agricola
Soares,Dênis de Moura; Galvão,Lênio Soares; Formaggio,Antônio Roberto.
Images acquired at the same day by the ETM+/Landsat-7 (30 m of spatial resolution) and MODIS/Terra (250 m) sensors were used to estimate areas of three major crops (soybean, sugarcane, and corn) with different landscape patterns in Southeastern Brazil. Majority filtering of ETM + classification results was applied to describe the behavior of 15 selected landscape metrics at distinct simulated spatial resolutions (90, 150, 210 and 270 m). By using regression models, the performance of MODIS and derived metrics to predict adequately the crop area, considering ETM+ data as reference, were analyzed. Results showed that the MODIS instrument overestimated the areas of soybean (15%) and sugarcane (1%), and underestimated the area of corn (12%). Multiple...
Tipo: Info:eu-repo/semantics/article Palavras-chave: MODIS; Remote sensing; Regression; Soybean; Sugarcane.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500003
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Development of empirical regression equations for predicting the performances of disc plough and harrow in clay-loam soil CIGR Journal
Oduma, Okechukwu.
Abstract: The regression equations for predicting the performances of plough and harrow implements in clay – loam soil in South – East agro – ecological region of Nigeria were developed. This is to enable farmers, farm managers and users of farm machinery assess and select proper machinery based on soil type/ condition for good performance of the machine and to avoid unnecessary breakdown/failures or energy loss during operation and generally to optimize production at minimum cost. Results showed that for plough operated in clay – loam soil, the regression equation that can predict its various performance indicators are: field efficiency, Y = 0.067x2 – 0.7733x + 89.283; effective field capacity, Y = 0.0864x2 – 1.4406x +6.8173; theoretical field capacity, Y...
Tipo: Info:eu-repo/semantics/article Palavras-chave: AGRICULTURAL AND BIORESOURCES ENGINEERING Keywords: empirical; Harrow; Plough; Performances; Regression; Soil type..
Ano: 2019 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5390
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Dislocation and Regression of the Role of Collective in Land Transfer AgEcon
Xu, Wei; Yuan, Jingheng.
This paper expounds the origin of "collective" in the process of collective land transfer, and analyzes the dislocation phenomenon of the role of collective in the process of collective land transfer as follows: deviation of the role under the conflict of identity; offside of the role under the limitation of democratic construction; omission of the role under the segmentation of interests. In order to protect me legitimate rights of farmers, we should make the role of collective to revert on the basis of township government, farmer and collective, so that the role of collective is restored under the management of government; the role of collective reverts under the supervision of farmers; the role of collective returns under its own strengthening of...
Tipo: Journal Article Palavras-chave: Land transfer; Role of collective; Dislocation; Regression; China; Agribusiness.
Ano: 2011 URL: http://purl.umn.edu/118289
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Efficiency and sustainability assessment for a group of farmers in the Brazilian Amazon. Repositório Alice
GOMES, E. G.; MELLO, J. C. C. B. S. de; SOUZA, G. da S. e; MEZA, L. A.; MANGABEIRA, J. A. de C..
The aim of this paper is to use DEA models to evaluate sustainability in agriculture. Several variables are taken into account and the resulting efficiency is measured by comparison. The performance of family farms is analysed here (variables: farmed area, work force, and production). As agricultural sustainability depends on the maintenance of systems of production for long periods of time, the models were run for the years of 1986 and 2002. Tiered DEA models were used to group farmers in sustainability categories. Non-parametric regression models were used to identify the factors affecting the efficiency measurements. All the results indicate that the majority of the farmers increased their efficiency along the time. These improvements may support the...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Data envelopment analysis; Iso - efficiency tiers; Regression; Family farms..
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/657362
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Efficiency and sustainability assessment for a group of farmers in the Brazilian Amazon. Repositório Alice
GOMES, E. G.; MELLO, J. C. C. B. S. de; SOUZA, G. da S. e; MEZA, L. A.; MANGABEIRA, J. A. de C..
The aim of this paper is to use DEA models to evaluate sustainability in agriculture. Several variables are taken into account and the resulting efficiency is measured by comparison. The performance of family farms is analyzed here (variables: farmed area, work force, and production). As agricultural sustainability depends on the maintenance of systems of production for long periods of time, the models were run for the years of 1986 and 2002. Tiered DEA models were used to group farmers in sustainability categories. Non-parametric regression models were used to identify the factors affecting the efficiency measurements. All the results indicate that the majority of the farmers increased their efficiency along the time. These improvements may support the...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Data envelopment analysis; Iso - efficiency tiers; Regression; Family farms.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/32105
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Endogenous losses and true digestibility of phosphorus in rice bran with or without phytase determined with piglets Ciência Rural
Lucca,Walter; Alves,Débora Aline; Rocha,Leonardo Tombesi da; Shirmann,Graciele Dalise; Camargo,Claudiele Aparecida do Santos; Figueiredo,Andriele Medianeira; Zanella,Irineo; Oliveira,Vladimir de.
ABSTRACT: The aim of this study was to determine endogenous losses and true total digestibility of phosphorus (P) in piglets fed with diets containing rice bran (RB), and supplemented or not with phytase. The experiment was divided into three periods of 12 days each, seven for adaptation and five for total feces collection, with an interval of three days between periods. Twelve barrows with average body weights of 13.40±1.00kg at 46 days of age were distributed among six treatments consisting of diets formulated with three levels of RB (5%, 10%, and 20%) with or without the addition of 750FTUkg-1 of phytase. The amount of total daily feed was divided into four daily meals and water was available ad libitum. The method of total feces collection was used...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Endogenous losses; Phytase; Regression; Total collection.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000601082
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Erratum and discussion of propensity–score reweighting AgEcon
Nichols, Austin.
Tipo: Article Palavras-chave: Xtreg; Psmatch2; Nnmatch; Ivreg; Ivreg2; Ivregress; Rd; Lpoly; Xtoverid; Ranktest; Causal inference; Match; Matching; Reweighting; Propensity score; Panel; Instrumental variables; Excluded instrument; Weak identification; Regression; Discontinuity; Local polynomial; Research Methods/ Statistical Methods.
Ano: 2008 URL: http://purl.umn.edu/122619
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Estimation of leaf area for greenhouse cucumber by linear measurements under salinity and grafting Scientia Agricola
Blanco,Flávio Favaro; Folegatti,Marcos Vinícius.
The measurement of leaf area by linear parameters is a useful tool when plants cannot be destroyed for direct measurement. The objectives of this study were to establish equations to estimate the leaf area of greenhouse-cucumber and to evaluate the effects of salinity and grafting on this estimative. Non-grafted cucumber seedlings, cv. 'Hokushin', were transplanted in a greenhouse and were irrigated with water of different salinities (1.0, 3.2 and 5.0 dS m-1). In the second growing period, the same cultivar was grafted on Cucurbita spp. and the plants were irrigated with water of 1.4, 3.0 and 5.3 dS m-1. Leaves of different sizes were collected from both experiments and leaf area was determined by an integrating area meter. Leaf length (L) and width (W)...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Regression; Irrigation water salinity.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400001
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Estimation of light lamb carcass composition by in vivo real-time ultrasonography at four anatomical locations IPB - Escola Superior Agrária
Ripoll, G.; Joy, M.; Álvarez-Rodríguez, J.; Sanz, B.; Teixeira, A..
The objectives of this study were to study the relationship between in vivo ultrasound measurements and cold carcass measurements at 4 anatomical points of the backbone, and to establish regression equations to estimate carcass composition within the cold carcass weight range for Ternasco lambs (8 to 12.5 kg) by using ultrasonic measurements taken at a single location. Measurements of subcutaneous fat and skin thickness and of muscle depth and width were taken over the 10th to 11th and 12th to 13th thoracic vertebrae and the 1st to 2nd and 3rd to 4th lumbar vertebrae. These measurements were taken at 2 and 4 cm from the nearest end of the LM to the backbone and at 1/3 of the LM width with the probe perpendicular to and parallel to the backbone. The left...
Tipo: Article Palavras-chave: Carcass composition; Fat thickness; Muscle depth; Prediction; Regression; Ultrasound.
Ano: 2009 URL: http://hdl.handle.net/10198/4907
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Explaining dinophysis cf. acuminata abundance in Antifer (Normandy, France) using dynamic linear regression ArchiMer
Soudant, Dominique; Beliaeff, Benoit; Thomas, G.
Classical regression analysis can be used to model time series. However, the assumption that model parameters are constant over time is not necessarily adapted to the data. In phytoplankton ecology, the relevance of time-varying parameter values has been shown using a dynamic linear regression model (DLRM). DLRMs, belonging to the class of Bayesian dynamic models, assume the existence of a non-observable time series of model parameters, which are estimated on-line, i.e. after each observation. The aim of this paper was to show how DLRM results could be used to explain variation of a time series of phytoplankton abundance. We applied DLRM to daily concentrations of Dinophysis cf. acuminata, determined in Antifer harbour (French coast of the English...
Tipo: Text Palavras-chave: Phytoplankton; Dinophysis; Time series; Regression; Dynamic; Bayesian.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00337/44784/44490.pdf
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Farmer-to-Consumer Direct Marketing: The Role of Customer Satisfaction Measurement for Service Innovations AgEcon
Spiller, Achim; Zuhlsdorf, Anke; Mellin, Matthias.
The importance of direct marketing for high quality farm products has increased during the past few years. This paper analyses the impact of customer satisfaction and its driving forces for farmer- to-consumer direct marketing and is based on a customer survey in 33 organic and conventional on-farm stores in Germany. The results emphasise the role of store atmosphere and customer service as the main influencing factors on customer satisfaction.
Tipo: Conference Paper or Presentation Palavras-chave: Direct Marketing; Customer satisfaction; Regression; Service Quality; Agribusiness; Marketing.
Ano: 2007 URL: http://purl.umn.edu/6607
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