Friday, March 03, 2006

st: significant kwallis results

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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