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
OFFICE: (574)631-6668, (574)631-6463
HOME: (574)289-5227
EMAIL: [email protected]
WWW: http://www.nd.edu/~rwilliam
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