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Re: st: Using # sign with factor variables to create interactions
From
Christopher Swearingen <[email protected]>
To
[email protected]
Subject
Re: st: Using # sign with factor variables to create interactions
Date
Fri, 6 Aug 2010 17:02:56 -0400
The factor variable interactions are available for post-estimation using LINCOM.
e.g. ---
logistic outcome i.smoker##i.agegrp
lincom 1.smoker + 2.agegrp + 1.smoker#2.agegrp
You should be able to estimate all levels in this manner.
Best regards,
~c
________________________________________________________
Christopher Swearingen, Ph.D.
Assistant Professor of Pediatrics and Biostatistics
University of Arkansas for Medical Sciences
Department of Pedatrics
One Children's Way, Slot 512-43
Little Rock, AR 72202
http://www.arpediatrics.org/research/biostatistics
>
> Hi Statalisters,
>
> I'm using the new # sign notation with factor variables to create
> interactions. I would like to do post model linear combinations with
> the lincom command. Since the level indicator variables are not created
> in the dataset (or memory I believe), how do I do linear combinations
> after running a model that incorporated an interaction using the # sign
> notation (ex. smoker#agegrp)? I've discovered that I could just change
> the base level in order to see different linear combinations but this
> requires running new models for each combination I want. Is this the
> best way to do it with the new notation?
>
> Tom Weichle
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