library(ltm)
ITFdata <- alea1
modelGRM <- grm(ITFdata[c(1:60)], constrained=TRUE, IRT.param=FALSE)
modelGRM
modelGRM <- grm(ITFdata[c(1:60)], constrained=TRUE, IRT.param=FALSE)
Erreur dans log.pr[xj, ] : indice hors limites
Any idea how to fix this problem, and what is the problem ?
Thx