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.

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