Hi, I'm trying to run this command:
gpcm(data, constraint = "gpcm")
with full code:
data<-read.csv("OJ_FIX3.csv", sep=c(",",";"),header = TRUE)
library(ltm)
gpcm(data, constraint = "gpcm")
but it gives me:
Error in if (any(ind <- out == 1)) out[ind] <- 1 - eps :
missing value where TRUE/FALSE needed
I tried to use reprex but reprex itself give me an error
This is the data I used: