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Re: st: Comparing 2 models with -test- command under SVY


From   Richard Williams <Richard.A.Williams.5@nd.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>, "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Comparing 2 models with -test- command under SVY
Date   Fri, 21 Aug 2009 17:10:48 -0400

At 04:53 PM 8/21/2009, Shellenberg, Kristen wrote:
I want to compare this model with a model without the interaction term...Can anyone help me understand how to how to compare the two models? I tried using the -test- command after running the model that includes the interaction term and forcing the coefficients of the interaction terms to =0 but it didn't work. Also, there are so many interaction terms b/c of all the dummy variables that it just seems like a big mess!!

Any help would be greatly appreciated!

Kristen, all the dummies and interactions created by -xi3- get tacked on as variables at the end of the file. So, it should just be a matter of typing

test

and (before hitting return) selecting the interaction terms that were created (which will start with _ and have an X in their names). A simple example:

webuse nhanes2f
xi3: svy: reg weight i.female*i.race
test  _Ife1Xra2 _Ife1Xra3


-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
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EMAIL:  Richard.A.Williams.5@ND.Edu
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