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Re: st: Mann-Whitney/Wilcoxon power analysis


From   Jeph Herrin <junk@spandrel.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Mann-Whitney/Wilcoxon power analysis
Date   Sat, 10 Oct 2009 15:11:04 -0400


Look up the Asymptotic Relative Efficiency (ARE) of the Mann
Whitney, a lower bound for scaling versus the t-test - with fairly
mild assumptions you can know you are safe with something like 1.6
times the sample size for a t-test.

hth,
Jeph



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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