R-beta: offset and glm again

Mike Meyer (mikem@stat.cmu.edu)
Wed, 03 Jun 1998 15:56:21 -0400


Message-Id: <199806031956.PAA18949@desire.stat.cmu.edu>
To: r-help@stat.math.ethz.ch
Subject: R-beta: offset and glm again
Date: Wed, 03 Jun 1998 15:56:21 -0400
From: Mike Meyer <mikem@stat.cmu.edu>

I guess I understand it now (although it is surprising to me).

The following is a valid model formula
	fred ~ wilma + offset(barney)
that sets the model offset to barney.

Given that this works, it would seem that one could remove the 
	offset =
argument from the glm call (and document the offset feature somewhere).

Too bad that one can't set weights the same way.

The anova bug when offsets are used is still there.

(Thomas, you seem to be the last to hack on glm, have I got it right?)


Mike Meyer, Department of Statistics, Carnegie Mellon University


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