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Empirical Package in R 

Wang and Henderson (2021) Estimation of a varying coefficient, fixed-effects Cobb-Douglas production function in levels, Economic Letter. 

Wang and Henderson (2022) A semiparametric constant elasticity of substitution stochastic frontier model for panel data, Advanced in Econometrics.

Wang, Yao, Kumbhakar (2023) A flexible stochastic frontier model with panel data. Journal of Applied Econometrics

Wang, Sun, Kumbhakar (2024) A New Semiparametric Stochastic Frontier Model: Addressing Inefficiency and Model Flexibility using Panel Data, Empirical Economics.

R Code for Frontiers in Econometrics (2nd-year graduate course)

Chapter 1: Nonparametric Kernel Density Estimation

Chapter 2: Nonparametric Regression Estimation

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