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Re: st: interaction


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: interaction
Date   Wed, 28 Sep 2005 12:01:42 -0700 (PDT)

Thank you.

--- maartenbuis <maartenbuis@yahoo.co.uk> wrote:

> --- Ricardo Ovaldia <ovaldia@y...> wrote:
> > I remember seen something on statalist or SJ about
> > getting a single test statistic or p-value for the
> > interaction term when the variables involved have
> many
> > levels (for example: continuous*categorical). I
> have
> > looked for it but can not findit. Does anyone
> recall
> > this?
> 
> I don't recall that discussion but try:
> 
> sysuse auto
> xi: reg price i.rep78*mpg
> test  _IrepXmpg_2  _IrepXmpg_3  _IrepXmpg_4
> _IrepXmpg_5
> 
> which test the hypothesis that all interaction terms
> are simultaniously 
> equal to zero
> 
> Hope this helps,
> Maarten
> 
> 
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> 


Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK


		
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