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Re: st: adjusted Mann-Whitney/Wilcoxon test

From   David Airey <david.airey@Vanderbilt.Edu>
Subject   Re: st: adjusted Mann-Whitney/Wilcoxon test
Date   Thu, 9 Apr 2009 12:22:41 -0500

To me, stratified generally means controlling for a non-continuous covariate.

-Somersd- provides rank-based statistics for group comparisons allowing for strata.


On Apr 9, 2009, at 10:45 AM, Constantine Daskalakis wrote:

I have the same question as Ricardo.

By stratified, we mean controlling for another covariate:

Wilcoxon of Y by X, controlling for Z

StatXact does this stratified Wilcoxon.

David, the parallel is Mantel-Haenszel for dichotomous outcome.

So, the command would look something like this:

ranksum y x, by(z)


ranksum y, by(x) strata(z)

On 4/9/2009 10:44 AM, David Airey wrote:
If ttest generalizes to regress, then ranksum generalizes to what?
There is a lot of literature on ranksum tests with clustered data if that's what you mean. Maybe you can define your data more precisely...
On Apr 9, 2009, at 8:44 AM, Ricardo Ovaldia wrote:

Dear all,

Is there a way to adjust the -ranksum- test for covariates? Or is there another way to do an adjusted Mann-Whitney U test? Something similar to relationsip between ttest and regress.

Thank you,

Ricardo Ovaldia, MS
Oklahoma City, OK


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Constantine Daskalakis, ScD
Associate Professor,
Thomas Jefferson University, Division of Biostatistics
  1015 Chestnut St., Suite M100, Philadelphia, PA 19107
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