On Fri, 29 Jan 2010, Ashta wrote:
Hi All,
Does the step function work in this model? I tried to run the
following model but no result obtained. The computer is hanging and I
killed the job several times. Below is the code.
library(survival)
m.fit=clogit(y~x1+x2+x3+x4, data=ftest)
summary(m.fit)
final<- step(m.fit)
You need to "provide commented, minimal, self-contained, reproducible
code" such as:
fit <- clogit(I(state=='treated')~.,Puromycin)
step(fit)
which runs just fine.
You have no strata() in your formula. Are you sure you want clogit??
If so, use an idiom like
step(fit, scope=list(lower=~strata(stratvar)) )
HTH,
Chuck
Thanks in advance.
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:cbe...@tajo.ucsd.edu UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
