Produção forrageira e valor nutritivo do capim elefante (Pennisetum purpureum Schum.) vars. Anã e Cameron.

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Características do solo e de pastagens em sistemas de produção leiteira em Uruará, Pará.

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Manejo das pastagens de quicuio-da-amazônia e andropogon em Paragominas, PA.

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Sistemas silvipastoris na Amazônia Oriental.

A problemática das pastagens. Os sistemas silvipastoris (SSP). O papel da árvore. Interação árvore - pastagem. Componente animal. Sistemas silvipastoris praticados na Amazônia Oriental. Avaliação de sistemas silvipastoris. Adoção de sistemas silvipastoris.bitstream/item/63268/1/Oriental-Doc56.pd

Bayesian estimation of inefficiency heterogeneity in stochastic frontier models

Estimation of the one sided error component in stochastic frontier models may erroneously attribute firm characteristics to inefficiency if heterogeneity is unaccounted for. However, unobserved inefficiency heterogeneity has been little explored. In this work, we propose to capture it through a random parameter which may affect the location, scale, or both parameters of a truncated normal inefficiency distribution using a Bayesian approach. Our findings using two real data sets, suggest that the inclusion of a random parameter in the inefficiency distribution is able to capture latent heterogeneity and can be used to validate the suitability of observed covariates to distinguish heterogeneity from inefficiency. Relevant effects are also found on separating and shrinking individual posterior efficiency distributions when heterogeneity affects the location and scale parameters of the one-sided error distribution, and consequently affecting the estimated mean efficiency scores and rankings. In particular, including heterogeneity simultaneously in both parameters of the inefficiency distribution in models that satisfy the scaling property leads to a decrease in the uncertainty around the mean scores and less overlapping of the posterior efficiency distributions, which provides both more reliable efficiency scores and rankings

Why such a tremendous expansion of cattle ranching in the Amazon? discussion from a new research methodology.

Resumo 2.7

Capim-tobiatã sob pastejo rotacionado em pequena propriedade de agricultura familiar e produtora de leite no Nordeste do Estado do Pará.

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