Please, use the appropriate list, e.g. r-help and you'll get a useful
answer with higher probability than here.
There is nothing mac specific in your mails
stefano
On 19/set/08, at 01:30, david dav wrote:
Hi,
I would like to fit a GLM model with GEE on clustered data.
I tried to use gee in the GEE package on a twin data set. All cluster
are of size 2. I removed the missing data first.
gee(Y ~ X1 + X2,
+ id = IDENTIF, family = binomial, corstr = "unstructured",
+ data =GP)
I get these results :
Beginning Cgee S-function, @(#) geeformula.q 4.13 98/01/27
running glm to get initial regression estimate
(Intercept) X1M X2Sans AMP X2Stim
-2.4791229 0.4250848 -0.1310666 -0.2151235
Error in gee(Y ~ X1 + X2, id = IDENTIF, family = binomial, corstr =
"unstructured", :
NA/NaN/Inf dans un appel `a une fonction externe (argument 2)#in a
call to an external function would be the translation
De plus : Warning message:
In gee(Y ~ X1 + X2, id = IDENTIF, family = binomial, corstr =
"unstructured", :
NAs introduits lors de la conversion automatique
geepack does not work any better when the regression gives results
with SAS version 8 on the same dataset (results are pretty close from
the results of a naive logistic regression).
I tried to change the explanatory variables (X1 alone, X2 alone, other
possible explanatory vairables : no result). I do not find where the
error comes from.
Thank you for your help.
David
Using R2.7.2 and gee version 4.13-13
PS Naive logistic regression give similar results on R and SAS in my
case
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