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re: st: effect coding with interaction variables
From
Richard Williams <[email protected]>
To
"[email protected]" <[email protected]>, "[email protected]" <[email protected]>
Subject
re: st: effect coding with interaction variables
Date
Wed, 10 Mar 2010 08:46:20 -0500
At 07:57 AM 3/10/2010, Airey, David C wrote:
.
Phil Ender has written "anovalator" which gets you interaction tests
from indicator coded regression _as if_ you had used effect coding
(http://www.ats.ucla.edu/stat/stata/faq/anovalator.htm). Especially,
see the FAQ on use of the margins command here, if you are using
Stata 11 (http://www.ats.ucla.edu/stat/stata/faq/default.htm).
This sounds good. Perhaps some future version of Stata will allow
effect coding in addition to the current 0/1 coding you get with the
i.xvar notation. Mitchell & Ender's -xi3- command (available from
UCLA) has a lot of nice coding options that can sometimes be helpful.
-------------------------------------------
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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