## File Name: rm_facets_est_b_rater.R
## File Version: 0.22
#########################################
# estimation of rater severity
rm_facets_est_b_rater <- function( b.item, b.rater, Qmatrix, tau.item,
VV, K, I, TP, a.item, a.rater, item.index, rater.index,
n.ik, numdiff.parm=.001, max.b.increment=1, theta.k, msteps,
mstepconv, b.rater.center, b.rater.fixed )
{
h <- numdiff.parm
diffindex <- rater.index
RR <- length(b.rater)
cat(" M steps b.rater parameter |")
it <- 0
conv1 <- 1000
#--- input for rm_facets_calcprobs
args <- list( b.item=b.item, b.rater=b.rater, Qmatrix=Qmatrix, tau.item=tau.item, VV=VV, K=K, I=I, TP=TP,
a.item=a.item, a.rater=a.rater, item.index=item.index, rater.index=rater.index,
theta.k=theta.k, RR=RR )
#---- begin algorithm
while( ( it < msteps ) & ( conv1 > mstepconv ) ){
b0 <- b.rater
args$b.rater <- b.rater
pjk <- do.call( what=rm_facets_calcprobs, args=args)
args$b.rater <- b.rater + h
pjk1 <- do.call( what=rm_facets_calcprobs, args=args)
args$b.rater <- b.rater - h
pjk2 <- do.call( what=rm_facets_calcprobs, args=args)
#-- increment
res <- rm_numdiff_index( pjk=pjk, pjk1=pjk1, pjk2=pjk2, n.ik=n.ik, diffindex=diffindex,
max.increment=max.b.increment, numdiff.parm=numdiff.parm )
increment <- res$increment
b.rater <- b.rater + increment
if ( ! is.null( b.rater.fixed) ){
ind <- which( ! is.na( b.rater.fixed ) )
b.rater[ind] <- b.rater.fixed[ind]
res$d2[ ind ] <- -1E10
}
brc <- mean( b.rater )
#-- centering
b.rater <- rm_center_vector( vec=b.rater, center_type=b.rater.center)
conv1 <- max( abs( b.rater - b0 ) )
it <- it+1
cat("-")
}
cat(" ", it, "Step(s) \n")
res <- list(b.rater=b.rater, se.b.rater=sqrt( abs(-1/res$d2 ) ),
ll=sum(res$ll0), brc=brc )
return(res)
}
.rm.facets.est.b.rater <- rm_facets_est_b_rater
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