Date: Thu, 14 May 1998 10:29:47 +0200
Reply-To: martin trollope <martint@HOLLARD.CO.ZA>
Sender: "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From: martin trollope <martint@HOLLARD.CO.ZA>
Subject: Proc Genmod - Scale Parameter
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We are using this proc to build a multiplicative model based on a set of variables <parameters> (e.g. gender, marital status etc.).
In the output of PROC GENMOD there is an intercept and a set of relative factors for each value of each parameter. The intercept represents the observed frequency and each of the relative factors is used to adjust this frequency according to the specific combination of parameter values in a particular observation.
i.e. Frequency = Intercept * Relative Factor for Gender * Relative Factor for Marital Status * ......
In the output, however, there is a 'parameter' called SCALE which is automatically output (in the same way as the intercept is output automatically).
What does this scale value represent and how should we allow for it in our multiplicative model? Should we allow for it at all?
Any help would be greatly appreciated