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
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
