Programming the statistical procedures from SAS

Power Analysis & Mann-Whitney test

Reply
Occasional Learner
Posts: 1

Power Analysis & Mann-Whitney test

I need help in deciding which responce function to use in (post-hoc) power calculation for Mann-Whitney test: normal, laplace, logistic etc. Is there any theoretical resource that could explain in which case which fonction is most appropriate? Thank you in advance!

Occasional Contributor
Posts: 10

Re: Power Analysis & Mann-Whitney test

You can always run the test for a sample dataset and check for the Real time and CPU time from the SAS log for all the functions. Based on the timings, you can easily decide, as to which approach will be more speedy for your dataset you are working with.
Valued Guide
Posts: 2,108

Re: Power Analysis & Mann-Whitney test

I would typically use ordinal.  The Mann-Whitney test is a rank-based test, so the results are invariant under monotonic transformations.  If you have some idea of the underlying distribution, then you could choose that.  However, ordinal will always work.

 

There is a huge literature on why one should NOT do post hoc power analysis.  That doesn't keep my clients from asking for it.  Smiley Happy

Ask a Question
Discussion stats
  • 2 replies
  • 139 views
  • 3 likes
  • 3 in conversation