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


From   "Ploutz-Snyder, Robert (JSC-SK)[USRA]" <robert.ploutz-snyder-1@nasa.gov>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: xtmixed versus spss mixed; random intercept only model
Date   Fri, 24 Sep 2010 07:32:39 -0500

Thanks for this  Richard and Phil.

On Sep 23, 2010, at 5:18 PM, "Richard Williams" <richardwilliams.ndu@gmail.com 
 > wrote:

> 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. ...
>> -----------------------
>>
>> Robert,
>>
>> 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
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> WWW:    http://www.nd.edu/~rwilliam
>
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