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Re: st: Testing for effect modification in Stata


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Testing for effect modification in Stata
Date   Tue, 5 Mar 2013 16:58:10 +0100

The problem will be the post-estimation commands, which may or may not
rely on information from the factor variable notation. Worse, these
could give you plausible looking results that are still wrong. For
example I would no longer trust -margins- and -marginsplot- with this
settup. I strongly recommend that you fix your "local admin problem"
rather than continue in this extremely fragile settup.

-- Maarten

On Tue, Mar 5, 2013 at 4:29 PM, Amal Khanolkar wrote:
> Thanks for pointing it out Maarten - I do recall our last discussion - however I've had issues with updating estout for local admin reasons. Nontheless if I run all regression models exactly as shown in my previous post with out the 'xi' prefix on a colleagues' computer, I still get get the exact same model results, regression, interactions and LRTest as shown previously  :)
>
> Thanks!
>
> Amal Khanolkar
> ________________________________________
> From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] on behalf of Maarten Buis [maartenlbuis@gmail.com]
> Sent: 05 March 2013 16:15
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: Testing for effect modification in Stata
>
> On Tue, Mar 5, 2013 at 4:02 PM, Amal Khanolkar wrote:
>> eststo: xi: regress Y  i.smoke ib3.magecat ib2.education i.famsit_new2 ib2.MBMI4 if multibirth==1 & ethnicity_bi2==1, vce (robust)
>
> Nick and I have explained to you before that this is very wrong.
> Please read our advice again:
> <http://www.stata.com/statalist/archive/2013-02/msg00376.html>
> <http://www.stata.com/statalist/archive/2013-02/msg00369.html>
>
> -- Maarten
>
> ---------------------------------
> Maarten L. Buis
> WZB
> Reichpietschufer 50
> 10785 Berlin
> Germany
>
> http://www.maartenbuis.nl
> ---------------------------------
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-- 
---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany

http://www.maartenbuis.nl
---------------------------------

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