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