Minimun sample for a Mann-Whitney U test

dmon

New Member
#1
Hello! :wave:

What is the minimun sample per group for a Mann-Whitney U test?

I appreciate if you give also a reference about it

Thanks!
 

rogojel

TS Contributor
#2
hi,
there are no simple formulas because the the test does not assume (much) in terms of distributions. There is a kindoff lose rule asking to add about 20% to the sample size you would have in the case of an equivalent parametric test, but that is just a rough rule.

regards
rogojel