Identification and estimation of panel semiparametric conditional heteroskedastic frontiers with dynamic inefficiency

Jun Cai, William C. Horrace and Yoonseok Lee

Econometric Reviews, 2024, vol. 43, issue 5, 238-268

Abstract: We study a semiparametric panel stochastic frontier model with nonseparable unobserved heterogeneity, which allows for time-varying conditional heteroskedastic productivity components. It does not require distributional assumptions on random noise except conditional symmetry. We utilize conditional characteristic functions from Kotlarski’s Lemma to derive new moment conditions that yield the identification of the heteroskedastic variance parameters of inefficiency and random noise. Identification only requires a panel with three periods for serially correlated inefficiency. A nonparametric estimation procedure is also developed for the conditional variance of inefficiency, and its convergence rate is established. Monte Carlo simulation shows that the estimator is robust to misspecification of inefficiency distributions.

Date: 2024
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DOI: 10.1080/07474938.2024.2328905

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