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Re: st: Mann-Whitney/Wilcoxon power analysis


From   Graham Smith <myotisone@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Mann-Whitney/Wilcoxon power analysis
Date   Tue, 13 Oct 2009 20:29:16 +0100

Richard,

Thanks, I will see if I can get hold of these.

Graham

2009/10/13 Richard Goldstein <richgold@ix.netcom.com>:
> 1. there have recently been a couple of article about this:
>
> Rosner, B and Glynn, RJ (2009), "Power and Sample Size Estimation for
> the Wilcoxon Rank Sum Test with Application to Comparisons of C
> Statistics from Alternative Prediction Models," _biometrics_, 65: 188-197
>
> Yan D. Zhao1, Dewi Rahardja2 and Yongming Qu1 (2008), "Sample size
> calculation for the Wilcoxon–Mann–Whitney test adjusting for ties,"
> _Statistics in Medicine_, 27: 462-468
>
> literature on this goes back to at least a 1987 article by Noether in
> Journal of the American Statistical Association
>
> 2. note that some of the other answers imply that this test is very
> robust; this appears to be too strong a statement; see, e.g., Fagerland,
> MW and Sandvik, L (2009), "The Wilcoxon-Mann-Whitney test under
> scrutiny," _Statistics in Medicine_, 28: 1487-1497
>
> Rich
>
> Graham Smith wrote:
>> Can anyone point me towards any help for doing a power analysis for a
>> Mann-Whitney  test (I'm still using v8 of stata if it matters)
>>
>> Many thanks,
>>
>> Graham
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