Transcription of The Wilcoxon Rank-Sum Test - Department of Statistics
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The Wilcoxon Rank-Sum Test - Department of Statistics
1 The Wilcoxon Rank-Sum TestThe Wilcoxon Rank-Sum test is a nonparametric alternative to the two-samplet-test which is based solely on the order in which the observationsfrom the two samples fall. We will use the following as a running 1In a genetic inheritance study discussed by Margolin [1988],samples of individuals from several ethnic groups were taken. Blood sampleswere collected from each individual and several variables measured. For adetailed discussion of the study and a de nition of the variable, see Exer-cises in the text. We shall compare the groups labeled \Native Amer-ican" and \Caucasian" with respect to the variableMSCE(mean sister chro-matid exchange).
1 The Wilcoxon Rank-Sum Test The Wilcoxon rank-sum test is a nonparametric alternative to the two-sample t-test which is based solely on the order in which the observations from the two samples fall. We will use the following as a running example.
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