F?re R and S Grosskopf (1995). “Nonparametric-Tests of Regularity, Farrell Efficiency, and Goodness- of-Fit.” J Econometrics 6: 415-425.
F?re R and S Grosskopf (1995). “Nonparametric-Tests of Regularity, Farrell Efficiency, and Goodness- of-Fit.” J Econometrics 6: 415-425.