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Re: st: Testing interaction terms when using factor variables
From
Richard Williams <[email protected]>
To
[email protected], [email protected]
Subject
Re: st: Testing interaction terms when using factor variables
Date
Thu, 27 Oct 2011 18:23:53 -0500
At 04:15 PM 10/27/2011, Jeffrey Pitblado wrote:
In Stata 12, Richard can use the new -contrast- command:
. contrast female#(c.year##c.year c.select c.articles
c.prestige), overall
The -overall- option specifies that -contrast- combine the tests of the
individually specified terms into an additional "Overall" test at
the end of the
Wald table.
Otherwise, Richard can use -testparm- instead of -test-.
. testparm 1.female#(c.year c.year#c.year c.select c.articles c.prestige)
Excellent! Thanks. I notice that the output of the contrast command includes
Margins : asbalanced
Is there any reason I would want to override that? I also tried
contrast 1.female#(c.year c.year#c.year c.select c.articles
c.prestige), overall asobserved
and it didn't seem to change anything other than saying "Margins:
asobserved" rather than "Margins: asbalanced".
-------------------------------------------
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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