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AW: st: Fwd: Interpreting dummy coded interactions with 3 levels


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   AW: st: Fwd: Interpreting dummy coded interactions with 3 levels
Date   Wed, 18 Feb 2009 17:26:10 +0100

<> 


If you want to implement Neil`s proposal, also look at -help nestreg- to
automate the task. The help file has an entry which shows how you can
combine the -xi- prefix with -nestreg-



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Neil Shephard
Gesendet: Mittwoch, 18. Februar 2009 17:12
An: statalist@hsphsun2.harvard.edu
Betreff: Re: st: Fwd: Interpreting dummy coded interactions with 3 levels

Can you not compare the reported R^2 or likelihoods (or even AIC or
BIC) for the different models?  Perhaps use -lrtest- to do this
"automagically"?

If you're asking how to actually write the commands to define the
models with interaction then see -man xi- (or
http://www.stata.com/help.cgi?xi ).

The following may also be useful...

http://www.ats.ucla.edu/stat/stata/Library/hetreg.htm
http://www.ats.ucla.edu/stat/stata/Library/logit_wgould.htm

Neil

-- 
"The combination of some data and an aching desire for an answer does
not ensure that a reasonable answer can be extracted from a given body
of data." ~ John Tukey

Email - nshephard@gmail.com
Website - http://slack.ser.man.ac.uk/
Photos - http://www.flickr.com/photos/slackline/
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