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Re: st: Two factor anova post test


From   Ángel Rodríguez Laso <angelrlaso@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Two factor anova post test
Date   Mon, 18 Jul 2011 23:05:48 +0200

Dear Ricardo;

If you were having many factors and many interactions, you should be
worried about and incresed alpha error level for the F-test, but with
2 factors I doubt this is a problem. Moreover, your p level for the
significance of sex is far away from the conventional 0.05, while the
interaction sex*race is non-significant. Therefore you can conclude
that there is a significant difference only between sexes. Because
there are only two levels, there is no need to carry out any posthoc
test like Scheffe, because you already know which means are different,
those of men and women.

Best regards,

Angel Rodriguez-Laso

2011/7/18 Ricardo Ovaldia <ovaldia@yahoo.com>:
> Hello,
>
> I performed a two factor ANOVA; one factor (sex) has 2 levels and the other factor (race) has 3 levels. The interaction term is not significant but one of the factors, race, is (p=0.0004). How can I determine which means are different while maintaining the experiment wise type I error rate.
>
> If I had only one factor, I could use -oneway- and then use, for example, scheffe for multiple comparisons. But not sure what to do with two factors.
>
> Thank you in advance,
> Ricardo
>
> Ricardo Ovaldia, MS
> Statistician
> Oklahoma City, OK
>
>
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