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re: st: effect coding with interaction variables

From   Richard Williams <>
To   "" <>, "" <>
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 ( Especially, see the FAQ on use of the margins command here, if you are using Stata 11 (

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
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