Exact Wilcoxon signed-rank and Wilcoxon Mann-Whitney ranksum

We present new Stata commands for carrying out exact Wilcoxon one-sample and two-sample comparisons of the median. Nonparametric tests are often used in clinical trials, in which it is not uncommon to have small samples. In such situations, researchers are accustomed to making inferences by using exact statistics. The ranksum and signrank commands in Stata provide only asymptotic results, which assume normality. Because large-sample results are unacceptable in many clinical trials studies, these researchers must use other software packages. To address this, we have developed new commands for Stata that provide exact statistics in small samples. Additionally, when samples are large, we provide results based on the Student’s t distribution that outperform those based on the normal distribution.


Issue Date:
2013
Publication Type:
Journal Article
DOI and Other Identifiers:
Record Identifier:
https://ageconsearch.umn.edu/record/243198
PURL Identifier:
http://purl.umn.edu/243198
Published in:
Stata Journal, 13, 2
Page range:
337-343
Total Pages:
9

Record appears in:



 Record created 2017-04-01, last modified 2020-10-28

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