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## File Name: rasch_jml_itemfit.R
## File Version: 0.05
#*** item fit Rasch model
rasch_jml_itemfit <- function( theta0, b, dat )
{
dat9 <- dat
dat9[ is.na(dat)] <- 9
ind <- is.finite(theta0)
dat2 <- dat9[ ind, ]
dat2.resp <- 1 * ( dat2 !=9 )
theta0 <- theta0[ ind ]
p <- .prob.rasch( theta0, b )
v <- p * (1 - p)
z2 <- dat2.resp * (dat2 - p)/v
z2d <- z2 * dat2.resp
infit <- colSums( z2d * v ) / colSums( v * dat2.resp )
outfit <- colSums(z2d) / colSums( dat2.resp )
res <- data.frame(infit, outfit )
return(res)
}
rasch.itemfit <- rasch_jml_itemfit
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