Date: Fri, 4 Mar 2005 12:56:30 -0500
Reply-To: Arthur Tabachneck <art297@NETSCAPE.NET>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Arthur Tabachneck <art297@NETSCAPE.NET>
Subject: Re: GLM and collinearity
I have to ask why you are concerned? I believe you will get the same
result regardless of which level is used as a dummy.
On Fri, 4 Mar 2005 00:49:37 -0500, Daniel Cournoyer
>Hi to All,
>When using PROC GLM to perform GLM (!) for a model where a class variable
>used as predictor, and where we know that one level will be dropped due to
>collinearity, is it possible to choose which level will be dropped by SAS?
>By default, the last one is dropped; in R, it is the first one that is
>dropped. Can I tell SAS which one I would want it to drop without having
>go through the manual way, i.e. create indicator variables and not include
>the one I want dropped.