Kruskal-Wallace power calculations.

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Sent from my phone. Please excuse my brevity.

Greetings, I am working on a project where we are applying the
Kruskal-Wallace test to some factor data to evaluate their correlation
with
existing grade data.  I know that the grade data is nonnormal therefore
we
cannot rely on ANOVA or a similar parametric test.  What I would like
to
find is a mechanism for making power calculations for the KW test given
the
nonparametric assumptions.  My perusal of the literature has suggested
that
a simulation would be the best method.

Can anyone point me to good examples of such simulations for KW in R? 
And
does anyone have a favourite package for generating simulated data or
conducting such tests?

   Thank you,
   Collin.

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