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Suppose that X = (Xi, X2, , Xn) and Y = (Yİ, ½, . . . ,Yn) are randon samples from continuous distributions F and G, respectively. Wilcoxons two-sample test statistic W W(X,Y) is defined to be Σǐ1+nn 1 R d n+m where Ri is the rank of Yn the combine sample.
2. Show that W can be written as where U is the number of pairs (X,, Y) with X, < Y,. In other words ΣΣん, whereん=0 if X, <; 0 otherwise n m i=1 j=1 Hint: Let Yi), Ya),..., Y(m) be the order statistics for the y-sample. Then U is the number of pairs (X,, Yo)) with X, Yo) For fixed j, the number of X, with X Yo) is just the rank of Y(j) minus the number of Yk uithYv < Yu), that is R,-j. Now sum over
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Solution: m of size m nondom sampen d.au an nem 사ure Population with dff(x) statistic is ditirud sum of ranks ‘f Y value orde

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