Hello, I have question regarding the lrm function and estimating the odds
ratio between different levels of a factored variable.
The following code example illustrates the problem I am having. I have a
data set with an outcome variable (0,1) and an input variable (A,B,C). I
would like to estimate the effect of C vs B, but when I perform the summary
I only get A vs B and A vs C, even though I specify that I want to see C vs
B. Am I missing something, any help is appreciated.
outcome<-sample(rep(c(0,1),10000),1000)
input <- sample(rep(c("A","B","C"),10000),1000)
dset <-data.frame(cbind(outcome,input))
dd <- datadist(dset)
options(datadist='dd')
mod <- lrm(outcome ~ input,data=dset,x=TRUE,y=TRUE)
summary(mod,est.all=FALSE,input=c("C","B"))
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