Not fully sure I am studying the Kruskal-Wallis test this term. It is a
chi-square test so different from an F test which is what we use in ANOVA.
I think an F test is a ratio of two chi-squared distributions. Or maybe
your confidence limits are for another distribution.
just some thoughts for you.
Rob Smith <[EMAIL PROTECTED]> wrote in message
uUrj4.9$[EMAIL PROTECTED]">news:uUrj4.9$[EMAIL PROTECTED]...
> 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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