Dear R-gurus:
I have a question about lmer.
Basically, I have a dataset, in which each observation records number of
trials (N) and number of events (Y) given a covariate combination(X) and
group id (grp_id).
So, my dataset is in tabular form. (in case my explanation of tabular form
is unclear,
please see the link:
http://www.stat.psu.edu/online/development/stat504/06_logreg/11_logreg_fitmodel.htm
)
My question: what is the lmer syntax for tabular data ("model Y/N=X" is the
what SAS does as seen in the link above).
In specific, where can I add N (number of trials) into the following line of
lmer code?
m1 <- lmer(Y ~ X+(1|grp_id), family=biomial(link="logit"))
As you may expect, I try to avoid expanding the tabular form data into
binary (0,1) outcome form data because doing so causes a quite large data
matrix in my study).
A link with similar question is seen at
https://stat.ethz.ch/pipermail/r-help/2008-May/161072.html
Seems to me, that link is implementing data expansion approach (they have
only 1600 obs after data expansion).
If someone knows a neat solution other than data expansion, please help.
Many thanks in advance!
-Sean
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