Goaïed, Mohamed; Ayed-Mouelhi, Rym - In: Journal of Productivity Analysis 13 (2000) 3, pp. 249-262
This paper is concerned with the estimation of stochastic frontier production functions with unbalanced panel data when unobservable firm efficiency levels are related to explanatory variables. ≪We use the weighted-means≫ Instrumental Variables method acknowledged to R. Gardner (1998) which...