Volume 46 of Advances in Econometrics presents essays in honor of Subhal Kumbhakar. His influence on the applied productivity and efficiency profession is legion, as evidenced by his voluminous body of research, must read textbook and attendance at sessions where he is presenting or his work is...

Traditional stochastic frontier models impose inefficient behavior on all firms in the sample of interest. If the data under investigation represent a mixture of both fully efficient and inefficient firms then off-the-shelf frontier models are statistically inadequate. We introduce the zero...

A simple graphical approach to presenting results from nonlinear regression models is described. In the face of multiple covariates, 'partial mean' plots may be unattractive. The approach here is portable to a variety of settings and can be tailored to the specific application at hand. A simple...