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Análisis de interpretación de los parámetros de relación de varianzas en el modelo de frontera estocástica

This work presents the results of a study carried out to point up the correct interpretation of the variances ratio in the stochastic frontier framework. We have evaluated the error which arises when the varance of the underlying normal variable is taken instead of that which corresponds to the truncated normal in the computation of the Gamma parameter. We have defined the real parameters on which decisions must be taken and have demonstrated that the above mentioned error prodeces an overevaluation of more than 750%, of the inefficiency presence. We also concluded that the evaluated error depens on the m /s ratio and on the inefficiency variable incidence in the composed error of the model.
Keywords: Efficiency, Stochastic Frontier, Composed Error, Truncated Normal.