Sueyoshi T and S Aoki (2001). “A Use of a Nonparametric Statistic for DEA Frontier Shift: the Kruskal and Wallis Rank Test.” Omega 29(1): 1-18.
Sueyoshi T and S Aoki (2001). “A Use of a Nonparametric Statistic for DEA Frontier Shift: the Kruskal and Wallis Rank Test.” Omega 29(1): 1-18.