[R] problem with logistic regression

Joe Nocera
Mon, 07 Feb 2005 16:48:28 -0000

CATMOD in SAS builds log-linear glms.  If you are truly trying to create
logistic
regressions in SAS, use PROC LOGISTIC instead.  If you really meant that you are
trying
to create log-linear models in R - then look up the usage of the function loglin
(e.g.
loglin())

Cheers,
Joe

Quoting Helene.Dryssens at eleves.polytech-lille.fr:

> Hi,
>
> we try to do a logistic regression with the function glm.
> But we notice that this function don't give the same results as the SAS
proc
> catmod (differents estimate given).
> We try to change the contrast on R system with:
> >
options(contrasts=c(unordered="contr.SAS",ordered="contr.poly"))
>
> We also try with brlr and logistf functions.
> Unfortunately, the estimate aren't still the same.
>
> Please could someone help us.
>
> Thank you
>
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Joseph J. Nocera
Ph.D. Candidate
NB Coop. Fish & Wildlife Research Unit
Biology Department - Univ. New Brunswick
Fredericton, NB
Canada   E3B 6E1
tel: (902) 679-5733

"Why does it have to be spiders?  Why can't it be 'follow the
butterflies'"?!
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