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st: Re: Post-Hoc test for Kruskal Wallis


From   "Joseph Coveney" <jcoveney@bigplanet.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: Post-Hoc test for Kruskal Wallis
Date   Tue, 16 Mar 2010 20:52:52 +0900

Ricardo Ovaldia wrote:

Is there a Post-Hoc test for Kruskal Wallis in Stata?
Something like the one proposed by Sokal and Rohlf (1995).

--------------------------------------------------------------------------------

I'm not sure whether it's the same test that you're referring to, but last
summer I had an occasion to program the Dwass, Steel, Critchlow-Fligner test.  I
used M. Hollander & D. A. Wolfe, _Nonparametric Statistical Methods_ Second
Edition. (New York: John Wiley & Sons, 1999) pp. 240--44 as the source for the
formula and for the worked example to verify the ado file's output.

It's not difficult to program, but I'll put it up on SSC once I write a help
file.  You'll need to install John Gleason's -qsturng- from SSC in order to get
the reference distribution for the test statistic (Studentized range) if you
want to avoid manual look-up.

Joseph Coveney


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