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Management of agricultural research center in Brazil: a DEA application using a dynamic GMM approach. Repositório Alice
SOUZA, G. da S. e; GOMES, E. G..
In this paper, we measure the performance for each of the Brazilian Agricultural Research Corporation research center by means of a Data Envelopment Analysis model. Performance data are available for a panel covering the period 2002-2009. The approach is instrumentalist, inte sense of Ramalho, Ramalho, and Henriques (2010). We investigate the effects onf performance of contextual variable indicator related to the intensity of partnerships and revenue generation. For this purpose, we propose a fractional nonlinear regression model and dynamic GGM 9Generalized Method of Moments) estimation. We do not rule out the endogeneity of the contextual variables, cross-sectional correlation or autocorrelation within the panel. We conclude that revenue generation and...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Data envelopment analysis; Contextual variables; Panel data; Fractional regression; GMM; Pesquisa agrícola.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1035751
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Comparação bayesiana de modelos de previsão de diferenças esperadas nas progênies no melhoramento genético de gado Nelore. Repositório Alice
SILVA, F.F. e; SÁFADI, T.; MUNIZ, J.A.; AQUINO, L.H. de; MOURÃO, G.B..
O objetivo deste trabalho foi realizar uma análise bayesiana de modelos auto-regressivos de ordem p, AR(p), para dados em painel referentes às diferenças esperadas nas progênies (DEP) de touros da raça Nelore publicados de 2000 a 2006. Neste trabalho, adotou-se o modelo AR(2), indicado pela análise prévia da função de autocorrelação parcial. As comparações entre as prioris, realizadas por meio do Fator de Bayes e do Pseudo-Fator de Bayes, indicaram superioridade da priori independente t-Student multivariada ? Gama inversa em relação à priori hierárquica Normal multivariada ? Gama inversa e a priori de Jeffreys. Os resultados indicam a importância de se dividir os animais em grupos homogêneos de acordo com a acurácia. Constatou-se também que, em média, a...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Algoritmos MCMC; Dados em painel; Modelo auto-regressivo; MCMC algorithm; Panel data; Autoregressive model.
Ano: 2008 URL: http://www.alice.cnptia.embrapa.br/handle/doc/123177
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Analysis of international competitive positioning of quality wine from Spain Ciencia e Investigación Agraria
Castillo,Juan Sebastián; García,Mª Carmen.
J.S. Castillo, and M.C. García. 2013. Analysis of international competitive positioning of quality wine from Spain. Cien. Inv. Agr. 40(3): 491-501. The global vitiviniculture sector is undergoing systemic and thorough changes. Spain occupies a privileged position in the global industry, ranking first in surface area, third in production and second in export volume. In recent years, domestic consumption has experienced a clear and pronounced decline, as observed in France and Italy. Therefore, exportation has become the main commercial avenue for table and quality wine. In Spain, designated quality wine represents 50% of total production and has experienced commercial dynamics in international markets that differ from those affecting table wine. The object...
Tipo: Journal article Palavras-chave: Agricultural economics; Competitiveness; Designation of origin; Foreign trade; Panel data; Quality wine.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000300003
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Ensuring representative economic data: survey data-collection methods in France for implementing the Common Fisheries Policy ArchiMer
Van Iseghem, Sylvie; Quillerou, Emmanuelle; Brigaudeau, Cecile; Macher, Claire; Guyader, Olivier; Daures, Fabienne.
Since 2001, Ifremer has implemented an economic data collection programme (EDCP) within the Data Collection Framework of the EU. It aims to obtain economic data from a sample of vessels representative of the entire French fishing fleet. This paper presents the strategies used for vessel sampling selection in the French EDCP and its implementation over several consecutive years. The approach is illustrated by the sampling plan for the fleet in the North Sea Channel Atlantic region. We show that the EDCP allows precise economic indicators such as gross revenue or fuel costs to be estimated for the whole fishing fleet, including small vessels (< 10 m), and consequently, it facilitates sound scientific advice regarding the Common Fisheries Policy. The...
Tipo: Text Palavras-chave: Data collection; Economic indicators; Fishery-dependent information; Panel data; Sampling; Small vessels; Statistical precision.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00043/15419/12958.pdf
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Estimation of multinomial logit models with unobserved heterogeneity using maximum simulated likelihood AgEcon
Haan, Peter; Uhlendorff, Arne.
In this paper, we suggest a Stata routine for multinomial logit models with unobserved heterogeneity using maximum simulated likelihood based on Halton sequences. The purpose of this paper is twofold. First, we describe the technical implementation of the estimation routine and discuss its properties. Further, we compare our estimation routine with the Stata program gllamm, which solves integration by using Gauss–Hermite quadrature or adaptive quadrature. For the analysis, we draw on multilevel data about schooling. Our empirical findings show that the estimation techniques lead to approximately the same estimation results. The advantage of simulation over Gauss–Hermite quadrature is a marked reduction in computational time for integrals with higher...
Tipo: Journal Article Palavras-chave: Multinomial logit model; Multinomial logistic model; Panel data; Unobserved heterogeneity; Maximum simulated likelihood; Halton sequences; Research Methods/ Statistical Methods.
Ano: 2006 URL: http://purl.umn.edu/117572
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Analysis of Farm Development in Dutch Agriculture and Horticulture AgEcon
Bremmer, Johan; Oude Lansink, Alfons G.J.M.; Olson, Kent D.; Baltussen, Willy H.M.; Huirne, Ruud B.M..
This paper analysis the effects of farmer characteristics, farm structure and farm performance on farm renewal and farm growth. The data set used in this research consists of panel data from the Dutch Farm Accountancy Data Network of farms specialized in plant production extended with a data from survey among those farms. Probit models were used to determine the likelihood of the changes. Results show that the degree of mechanization increases the probability of farm growth and farm renewal. Family labour input and solvency have a negative impact on farm growth. Farm size is positively correlated with farm renewal. No indications of the influence of the life cycle have been found.
Tipo: Conference Paper or Presentation Palavras-chave: Decision making; Diversification; Farm growth; Farm structure; Innovation; Panel data; Crop Production/Industries; Farm Management.
Ano: 2002 URL: http://purl.umn.edu/7025
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Trade Creation and Trade Diversion in the North American Free Trade Agreement: The Case of the Agricultural Sector AgEcon
Susanto, Dwi; Rosson, C. Parr, III; Adcock, Flynn J..
This paper examines the effect of the U.S.-Mexico trade agreement under the North American Free Trade Agreement (NAFTA). The results suggest that U.S. agricultural imports from Mexico have been responsive to tariff rate reductions applied to Mexican products. A one percentage point decrease in tariff rates is associated with an increase in U.S. agricultural imports from Mexico by 5.31% in the first 6 years of NAFTA and by 2.62% in the last 6 years of NAFTA. U.S. imports from Mexico have also been attributable to the pre-NAFTA tariff rates. Overall, the results indicate that the U.S.-Mexico trade agreement under NAFTA has been trade creating rather than trade diverting.
Tipo: Journal Article Palavras-chave: Agricultural sector; NAFTA; Panel data; Tariffs; Trade creation; Trade diversion; International Relations/Trade; F10; F15; Q17; Q18; C31; C33.
Ano: 2007 URL: http://purl.umn.edu/6618
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Production Risk and Technical Inefficiency in Russian Agriculture AgEcon
Bokusheva, Raushan; Hockmann, Heinrich.
This paper aims to contribute to a better understanding of possible causes of considerable production variability that characterised Russian agriculture during the last decade. The study investigates production risk and technical inefficiency as two sources that influence production variability. Using panel data from 1996 to 2001, an empirical analysis of 443 large agricultural enterprises from three regions in central, southern and Volga Russia is conducted. A production function specification accounting for the effect of inputs on both risk and technical inefficiency is found to describe production technologies of Russian farms more appropriately than the traditional stochastic frontier formulation.
Tipo: Conference Paper or Presentation Palavras-chave: Production risk; Technical efficiency; Panel data; Russian agriculture; Production Economics; D81; Q12.
Ano: 2005 URL: http://purl.umn.edu/24610
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Southeast Asian Agriculture Returns to Scale: Inferences from Cumulative Rolling Stochastic Frontier Analysis AgEcon
Xu, Zhen; Tu, Wen; Shaik, Saleem.
In this paper, we estimate the time-varying betas or input elasticities and returns to scale in a stochastic frontier cumulative rolling regression analysis framework using FAO data of Southeast Asian countries from 1960-2002. Empirical results indicated returns to scale are overestimated by pooled and panel models relative to stochastic frontier models without accounting for technical inefficiencies. Second, the time-varying estimates of betas or input elasticities and returns to scale indicate variations not only between the models but also over time.
Tipo: Conference Paper or Presentation Palavras-chave: Southeast Asian countries; Agriculture sector; Time-varying betas or input elasticities and returns to scale; Panel data; 1960-2002; Farm Management; Productivity Analysis.
Ano: 2007 URL: http://purl.umn.edu/9687
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Impactos da influenza aviária no mercado internacional de carnes AgEcon
Valente, Luiza Carneiro Mareti; Gomes, Marilia Fernandes Maciel; Campos, Antonio Carvalho.
Animal infectious disease outbreaks as Avian Influenza, Foot and mouth disease and Bovine Spongiform Encephalopathy can influence trade and bring economic consequences to affected countries. For this reason, this work aims to analyze the effects on meat import demand in the years of 1997 and 2003 to 2005, the Avian Influenza outbreaks period. The analytical framework used was panel data econometrics. The results point to a reduction on chicken meat demand in 1997 and increase to the other meats, indicating a possible substitution. From 2003 on, chicken meat demand showed slight increase, as did pig meat, only bovine meat demand showed a reduction. This fact can be explained by a restriction on bovine and chicken supply caused by the imposition of sanitary...
Tipo: Journal Article Palavras-chave: Avian Influenza; Import demand; Beef; Chicken meat; Panel data; International Relations/Trade.
Ano: 2009 URL: http://purl.umn.edu/94837
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Discussion: Applications and Innovations in Spatial Econometrics AgEcon
LeSage, James P..
These articles provide a discussion of studies presented in a session on spatial econometrics, focusing on the ability of spatial regression models to quantify the magnitude of spatial spillover impacts. Both articles presented argue that a proper modeling of spatial spillovers is required to truly understand the phenomena under study, in one case the impact of climate change on land values (or crop yields) and in the second the role of regional industry composition on regional business establishment growth.
Tipo: Journal Article Palavras-chave: Lagged variables; Panel data; Spatial spillovers; Community/Rural/Urban Development; Environmental Economics and Policy; Resource /Energy Economics and Policy; C33; C51.
Ano: 2011 URL: http://purl.umn.edu/113519
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Risk Adjusted Productivity Measures AgEcon
Glazyrina, Anna; Shaik, Saleem.
Tipo: Conference Paper or Presentation Palavras-chave: Risk; Productivity measures; DEA; Hyperbolic distance function; Panel data; Productivity Analysis; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010 URL: http://purl.umn.edu/56580
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What are the Enduring Effects of Fertilizer Subsidy Programs on Recipient Farm Households? Evidence from Malawi AgEcon
Ricker-Gilbert, Jacob; Jayne, Thomas S..
Replaced with revised version of paper 08/23/11.
Tipo: Working or Discussion Paper Palavras-chave: Fertilizer subsidies; Malawi; Sub-Saharan Africa; Endogeneity; Panel data; International Development; Political Economy; C23; C26; Q12; Q13; Q18.
Ano: 2011 URL: http://purl.umn.edu/109593
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Combining mixed logit models and random effects models to identify the determinants of willingness to pay for rural landscape improvements AgEcon
Campbell, Danny.
This paper reports the findings from a discrete choice experiment study designed to estimate the economic benefits associated with rural landscape improvements in Ireland. Using a mixed logit model, the panel nature of the dataset is exploited to retrieve willingness to pay values for every individual in the sample. This departs from customary approaches in which the willingness to pay estimates are normally expressed as measures of central tendency of an a priori distribution. In a different vein from analysis conducted in previous discrete choice experiment studies, this paper uses random effects models for panel data to identify the determinants of the individual-specific willingness to pay estimates. In comparison with the standard methods used to...
Tipo: Conference Paper or Presentation Palavras-chave: Agri-environment; Discrete choice experiments; Mixed logit; Panel data; Random effects; Willingness to pay; Demand and Price Analysis; Environmental Economics and Policy; C33; C35; Q24; Q51.
Ano: 2007 URL: http://purl.umn.edu/7975
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COMPARISON OF AGRICULTURAL FARM EFFICIENCY IN SLOVAK REGIONS BEFORE AND AFTER EU ACCESSION AgEcon
Sojkova, Z.; Kropkova, Z.; Kovae, S..
This paper presents results of stochastic parametric approach used in estimation of farm technical efficiency. The estimation of output oriented technical efficiency was based on Stochastic Frontier analysis with Cobb-Douglas production function. Model specification for empirical application were employed Battese and Coelli 1995 model specification, where technical inefficiency effects are explicitly expressed as a function of a vector of firm-specific variables and random error and integrated in the stochastic frontier model. Model also included dummy variable which expressed production conditions in which Slovak farms are operating. We divided farms into two groups of production conditions: productive regions (PR) and less favorable area (LFA) regions....
Tipo: Conference Paper or Presentation Palavras-chave: Less favorable area (LFA); Subsidy; Stochastic production frontier; Panel data; Output – oriented technical efficiency; Cobb-Douglas production function; Production Economics; Research Methods/ Statistical Methods.
Ano: 2008 URL: http://purl.umn.edu/6462
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Augmented Gravity Model: An Empirical Application to Mercosur-European Union Trade Flows AgEcon
Martinez-Zarzoso, Inmaculada; Nowak-Lehmann, Felicitas.
This paper applies the gravity trade model to assess Mercosur-European Union trade, and trade potential following the agreements reached recently between both trade blocs. The model is tested for a sample of 20 countries, the four formal members of Mercosur plus Chile and the fifteen members of the European Union. A panel data analysis is used to disentangle the time invariant country-specific effects and to capture the relationships between the relevant variables over time. We find that the fixed effect model is to be preferred to the random effects gravity model. Furthermore, a number of variables, namely, infrastructure, income differences and exchange rates added to the standard gravity equation, are found to be important determinants of bilateral...
Tipo: Journal Article Palavras-chave: Gravity equation; Panel data; Infrastructure; Integration; International Relations/Trade; F14; F15.
Ano: 2003 URL: http://purl.umn.edu/43996
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Production Efficiency in Ukrainian Agriculture and the Process of Economic Reform AgEcon
Kurkalova, Lyubov A.; Jensen, Helen H..
A representative sample of 49 state and collective farms in Ukraine provides data in physical units on livestock and crop production and input use for 1989-92. The changes in production efficiency for beef, pork, dairy, winter wheat, grain, and potato production, investigated using stochastic frontier methods, show declining technical efficiency in livestock production and especially low marginal contribution of labor inputs. The number of workers, size of farm, and distance from nearest city are related to efficiency in agricultural production.
Tipo: Working or Discussion Paper Palavras-chave: Technical efficiency; Panel data; Economies in transition; Frontier production function; Productivity Analysis.
Ano: 1996 URL: http://purl.umn.edu/18581
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Effect of infrastructure investments on total factor productivity (TFP) in Brazilian agriculture AgEcon
Mendes, Sergio Magno; Teixeira, Erly Cardoso; Salvato, Marcio Antonio.
Since the 1980s, the investments in infrastructure have been significantly reduced, jeopardizing Total Factor Productivity (TFP) and competitiveness of Brazilian agriculture. The Solow growth model with panel data is used to estimate TFP. An adaptation of the Zhang and Fan (2004) model for India, using the Generalized Method of Moments (GMM), is applied to study the effects of infrastructure investments on TFP. The lack of such investments in Brazil caused the effects to be larger and with lag periods smaller than in other countries. These investments affect TFP in the first years, and the study suggests that the return occurs in the period from zero to two years. Among the analyzed infrastructure elements, investments in roads have the greatest impact on...
Tipo: Conference Paper or Presentation Palavras-chave: Infrastructure investments; TFP; Agriculture; Panel data; GMM; International Development; Productivity Analysis.
Ano: 2009 URL: http://purl.umn.edu/50777
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HEALTH, BINGE DRINKING, AND LABOR MARKET SUCCESS: A LONGITUDINAL STUDY ON YOUNG PEOPLE AgEcon
Keng, Shao-Hsun; Huffman, Wallace E..
Health, like schooling, is a form of human capital and can be expected to be positively related to labor productivity and labor supply. The production of good health and labor productivity, however, sometimes competes with an individual's lifestyle, e.g., binge drinking. In this study, an individual's health has three dimensions: current health status, binge drinking which is an unhealthy lifestyle, and stature or mature height which is a young adult's health endowment. This study presents and fits a dynamic model of an individual's demand for health, demand for binge drinking, labor supply, and wage or demand for labor equations to NLSY 1979 cohort panel data of young people. We find that binge drinking has a negative but insignificant effect on the...
Tipo: Working or Discussion Paper Palavras-chave: Health; Labor productivity; Labor supply; Binge drinking; Youth; Panel data; Rational addiction; Human capital; Health Economics and Policy; Labor and Human Capital.
Ano: 1999 URL: http://purl.umn.edu/18252
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Estimating an Ex Ante Cost Function for Belgian Arable Crop Farms AgEcon
Hansen, Kristiana; Baudry, Alexandre; De Blander, Rembert; Frahan, Bruno Henry de; Polome, Philippe.
We estimate a farm-level cost function for Belgian crop farms using FADN data over the study period 1996-2006. We rely on an estimation of farmers' expected yields at the time cropping decisions are made rather than actual yields observed in the FADN data. The use of an ex ante cost function improves the cost function estimation. We subsequently suggest how our cost function can be used in simulations to analyze farmer response to changes in output price risk.
Tipo: Conference Paper or Presentation Palavras-chave: Cost function estimation; Panel data; Risk; Agricultural and Food Policy; Crop Production/Industries; Production Economics; Q12; Q18.
Ano: 2009 URL: http://purl.umn.edu/49477
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