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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   Sun, 11 Oct 2009 08:11:29 +0100

Jeph,

Thanks,  not something I was aware of as existing in such a specific manner.

Graham

2009/10/10 Jeph Herrin <junk@spandrel.net>:
>
> 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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