I have a question concerning power analysis. I want to estimate the
power of a test to detect a difference of a given size. The problem is that
I am using a nonparametric test, a Kruskal-Wallis test. I have no idea how
to calculate power for such a test; is it even possible (I found nothing
about it in the textbooks I checked)?
When I run an ANOVA on these same data, the p-value is nearly the same
as for the Kruskal-Wallis. The 2 differ by less than .03. So I am
wondering if it would be reasonable to use the power analysis from the
parametric test as an estimate of the power of the nonparametric test. This
idea is attractive to me because I can find information on the power of
ANOVA in my textbooks. What would you do? Thanks in advance.
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