I'm trying delve into the offset code in glm, and I have to admit I'm
getting
lost.
My particular concern is that if you do something like
glm( fred ~ wilma, offset=barney, data=betty)
then the offset is not found if barney is a component of the data frame
betty. (If you do the same thing with weights, then the weight is found in the
data frame).
I don't know if this is a design decision, and I can't follow the logic
of the
model.offsets
code.
I'm willing to try to fix the behaviour of the offset code, but I could use
some help understanding what all the current code. In particular is the
function called
model.extract
(which seems to play with offsets?) used anywhere.
Thanks, --Mike
Mike Meyer, Department of Statistics, Carnegie Mellon University
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at
stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
