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Re: st: significant kwallis results


From   clinton.thompson@summitllc.us
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: significant kwallis results
Date   Fri, 3 Mar 2006 07:18:59 -0800 (PST)

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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