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Re: st: significant kwallis results


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: significant kwallis results
Date   Fri, 3 Mar 2006 07:29:25 -0800 (PST)

Great, thank you.

--- clinton.thompson@summitllc.us wrote:

> ricardo,
> a user-written program, -kwallis2-, may get you
> where you want to go...
> --clint
> 
> >
> > Dear all,
> >
> > I use the nonparametric -kwallis- test and obtain
> > these significant results:
> >
> > . kwallis outcome ,by(group)
> >
> > Test: Equality of populations (Kruskal-Wallis
> test)
> >
> >   +---------------------------+
> >   |    group | Obs | Rank Sum |
> >   |----------+-----+----------|
> >   |  Placebo |  12 |   278.00 |
> >   |   Drug 1 |  12 |   265.00 |
> >   |   Drug 2 |  12 |   170.00 |
> >   |   Drug 3 |  12 |   107.00 |
> >   +---------------------------+
> >
> > chi-squared =    14.457 with 3 d.f.
> > probability =     0.0023
> >
> > chi-squared with ties =    14.457 with 3 d.f.
> > probability =     0.0023
> >
> >
> > Is there a way to test which drug groups differ
> while
> > maintaining the correct type I errror? Maybe,
> > something similar to Duncan's test after Anova, or
> > multiple adjustment method.
> >
> > Thank you,
> > Ricardo.
> >
> > Ricardo Ovaldia, MS
> > Statistician
> > Oklahoma City, OK
> >
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Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK

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