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MODELING HETEROGENEITY IN PRODUCTION MODELS: EMPIRICAL EVIDENCE FROM INDIVIDUAL FARMING IN POLAND AgEcon
Hockmann, Heinrich; Pieniadz, Agata; Goraj, Lech.
This discussion paper deals with the estimation of a random coefficient model. The virtue of this approach is that it considers firm heterogeneity, which conventional SFA models do not. Applying the model to Polish farms, the results indicate that the conventional random and fixed effect models overestimate the inefficiency score. In addition, the reasons for inefficiency are analyzed. It is shown that despite the fragmentation of Polish agriculture, there is no evidence for scale inefficiency. Moreover, inefficiency could partly be attributed to factors, which affect the management input and requirements on farms.
Tipo: Working or Discussion Paper Palavras-chave: SFA; Random component model; Poland; Management.; Agribusiness; Farm Management; Productivity Analysis; Research Methods/ Statistical Methods; Q12; D24.
Ano: 2007 URL: http://purl.umn.edu/91733
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Variables associated with the fluctuation of Rhynchophorus palmarum (Curculionidae) in influence area of oil palm and American oil palm in the Central Amazônia Sci. Agrar.Paran. / SAP
Cysne, Alex Queiroz; Rios, Sara de Almeida.
Rhynchophorus palmarum (L.) is one of the main pests of economic importance in the cultivation of  American oil palms. This work aimed to evaluate the influence of the management practices and environmental variables in the population of R. palmarum in area of seed production of Elaeis spp. in the Amazonas State, Brazil. The climate data (temperature, relative humidity, and rainfall), seed production (number of harvested bunches, number of female inflorescences) and capture of insects (traps baited with pheromone of aggregation and sugar cane (Saccharum officinarum L.) were collected, and subjected to statistical analysis, multiple linear regression, and Pearson’s correlation. It was observed that rainfall, minimal relative humidity and harvest of bunches...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coleoborers; Elaeis guineensis; Elaeis oleifera; Management..
Ano: 2017 URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/13876
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