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Re: Re: st: xtmixed versus spss mixed; random intercept only model

From   Richard Williams <>
Subject   Re: Re: st: xtmixed versus spss mixed; random intercept only model
Date   Thu, 23 Sep 2010 18:16:17 -0500

At 04:51 PM 9/23/2010, Philip Ender wrote:
Apparently you told Stata to "reverse reference" by using ib1.trmt
instead of i.trmt.   Is this documented somewhere?? ...
and while I get confused about how to use the r. notation, I'm aware
that it exists. ...


Try help fvvarlist.  This gives all of the options for coding factor
variables .  And yes,choice of reference group for dummy coding can
effect the values of the estimates even when the model is balanced.
Although, overall the models are equivalent regardless of the choice
of reference group.

Also see section 11.4.3 of the Stata 11 User's Guide. If you have Stata 11, you should have this available as a PDF file. I found this section very helpful.

Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME:   (574)289-5227
EMAIL:  Richard.A.Williams.5@ND.Edu

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