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OCR: Nonparametric Tests JMP offers three nonparametric tests for testing whether distributions across factor levels are centered at the same location. All these tests are from the rank -score family .Wilcoxon rank scores are simply the ranks of the data The Wilcoxon test the most powerful rank test for errors with logistic distributions. (Also called Mann- -Whitney U. called Kruskal-Wallis more than groups). Median rank scores are either 1 or 0 depending on whether rank is above or below the median rank. The Median test is the most powerful rank test for errors with doubly exponential distributions. .Van der Waerden rank scores are the ranks of the data divided by one plus the number of observations transformed to normal score ov applying inverse of the normal distribution function. The Van de ...