On Feb 22, 2012, at 12:03 AM, Subha P. T. wrote:
Hi David
My data set has about 20 significant variables and step function
with logistic regression is working fine( in R-commander). I tried
to get conditional logistic by introducing the stratum variable and
clogit. The clogit is not converging but is giving the summary of
the model. When step/step AIC/..are used, the message given is
"ERROR: number of rows in use has changed".
Caveat: I do not generally use stepwise methods and I have no
experience with this particular message. Nonetheless it suggests that
you have some variable in the model tat differs from the others with
respect to missingness. Have you tried using subset() or
complete.cases() to select a set of non-missing data for all tested
variables?
--
David Winsemius, MD
West Hartford, CT
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