Sickles RC (2005). “Panel Estimators and the Identification of Firm-Specific Efficiency Levels in Parametric, Semiparametric and Nonparametric Settings.” J Econometrics 126(2): 305-334.
Sickles RC (2005). “Panel Estimators and the Identification of Firm-Specific Efficiency Levels in Parametric, Semiparametric and Nonparametric Settings.” J Econometrics 126(2): 305-334.