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Asked 8 March 2014

How can I calculate the effect sizes of small samples (<20) for non-parametric tests Wilcoxon and Mann-Whitney U?

I want to calculate the effect sizes of Wilcoxon and Mann-Whitney tests. Can I use the formula r=Z/sqrt(N) when the samples are smaller than 20 (where N is all the observations) ?
Bruce Weaver
Lakehead University
Although I've not read them yet, I see that Robert Newcombe's book on confidence intervals for proportions & related measures (http://www.crcpress.com/product/isbn/9781439812785) has a chapter called "Generalised Mann-Whitney Measure" and another called "Generalised Wilcoxon Measure" (chapters 15 & 16 respectively). The original poster may find chapter 15 useful.
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