What hypotheses do “nonparametric” two-group tests actually test?

In this article, I discuss measures of effect size for two-group comparisons where data are not appropriately analyzed by least-squares methods. The Mann–Whitney test calculates a statistic that is a very useful measure of effect size, particularly suited to situations in which differences are measured on scales that either are ordinal or use arbitrary scale units. Both the difference in medians and the median difference between groups are also useful measures of effect size.


Issue Date:
2012
Publication Type:
Journal Article
DOI and Other Identifiers:
st0253 (Other)
PURL Identifier:
http://purl.umn.edu/207998
Published in:
Stata Journal, Volume 12, Number 2
Page range:
182-190
Total Pages:
11

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 Record created 2017-04-01, last modified 2017-08-28

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