Order tests are tests which use not the exact values of the observations, but only their order relations — i.e., only the relations x < y and x > y between the observed x and y. Since such tests are not based upon definite distribution functions for the quantities x and y, they are also called distribution-free, or nonparametric, tests.
KeywordsNull Hypothesis Power Function Wilcoxon Test Error Probability Asymptotic Distribution
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