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Re: st: Two factor anova post test


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Two factor anova post test
Date   Tue, 19 Jul 2011 03:18:50 -0700 (PDT)

Thank you Angel. The term that is significant is race, with three levels, therefore I am not completely sure which means are different, and I do not understand how to use -test-, or even if that is the correct way  to compare them.

Thank you,
Ricardo.

Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK


--- On Mon, 7/18/11, Ángel Rodríguez Laso <angelrlaso@gmail.com> wrote:

> From: Ángel Rodríguez Laso <angelrlaso@gmail.com>
> Subject: Re: st: Two factor anova post test
> To: statalist@hsphsun2.harvard.edu
> Date: Monday, July 18, 2011, 4:05 PM
> 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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> >
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