Dear list,
after fitting an lrm with the Design package (stored as "mymodel") I
try running a summary, but I get the following error:
dim(mydata)
[1] 235 9
names(mydata)
[1] "id" "VAR1" "VAR2" "VAR3" "VAR4" "VAR5" "VAR6" "VAR7" "VAR8"
summary(mymodel)
Error in `contrasts<-`(`*tmp*`, value = "contr.treatment") :
contrasts can be applied only to factors with 2 or more levels
but,
VAR1 is my dependent
nlevels(factor(VAR1))
[1] 2
VAR2 is continuous
summary(psa)
Min. 1st Qu. Median Mean 3rd Qu. Max.
0.90 6.05 8.40 10.99 13.15 59.70
and for the remaining variables...
nlevels(factor(VAR3))
[1] 2
nlevels(factor(VAR4))
[1] 2
nlevels(factor(VAR5))
[1] 3
nlevels(factor(VAR6))
[1] 2
nlevels(factor(VAR7))
[1] 2
nlevels(factor(VAR8))
[1] 2
What I am missing?
Thanks in advance,
David
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