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st: significant kwallis results


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: significant kwallis results
Date   Fri, 3 Mar 2006 07:13:02 -0800 (PST)

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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