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The Mann-Whltney test. Some problems concerning approximation of critical values and tied ranks

Guraj-Kaczmarek, Kazimiera; Parys, Dariusz; Tomaszewicz, Andrzej S. (Wydawnictwo Uniwersytetu Łódzkiego, 1993)

The nonparametric Mann-Whitney test [Mann-Whitneу (1947)] is one of commonly used two sample tests. The problem of tied ranks exists in the case of discrete distributions. It makes the analysis of distribution of Mann-Whitney ...