Maximum Likelihood Estimation of Stochastic Frontier Models with Endogeneity

04/26/2020
by   Samuele Centorrino, et al.
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We provide a closed-form maximum likelihood estimation of stochastic frontier models with endogeneity. We consider cross-section data when both components of the composite error term may be correlated with inputs and environmental variables. Under appropriate restrictions, we show that the conditional distribution of the stochastic inefficiency term is a folded normal distribution. The latter reduces to the half-normal distribution when both inputs and environmental variables are independent of the stochastic inefficiency term. Our framework is thus a natural generalization of the normal half-normal stochastic frontier model with endogeneity. Among other things, this allows us to provide a generalization of the Battese-Coelli estimator of technical efficiency. Our maximum likelihood estimator is computationally fast and easy to implement. We showcase its finite sample properties in monte-carlo simulations and an empirical application to farmers in Nepal.

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