James Fearon wrote:
Hi,
This concerns lrm in the Design package, which I need for the clustered
errors option with panel data.
I have created a variable (using sign()) that has values -1, 0, and 1
(and some NAs). call this variable x3. lrm does not like
t = lrm(y ~ x1 + x2 + I(x3==-1) + I(x3==1), data=data,x=T,y=T)
I get the error message: Error in if (!length(fname) || !any(fname ==
zname)) { :
missing value where TRUE/FALSE needed
Running this on the subset of data with non missing x3 values doesn't help.
glm has no problem with this.
Thanks very much,
Jim Fearon
Right, Design does not like variables to be split up. Make x3 a factor
and use it just as the single term x3 in the model.
Frank
--
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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