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)
or
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.
Ricardo Ovaldia, MS
Statistician
Oklahoma City, OK
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