## File Name: tam_mml_3pl_mstep_item_slopes_gammaslope_center.R
## File Version: 0.07
#*** centering gammaslope vector
tam_mml_3pl_mstep_item_slopes_gammaslope_center <- function( gammaslope,
gammaslope.center.index, gammaslope.center.value )
{
if ( ! is.null( gammaslope.center.index ) ){
M <- max( gammaslope.center.index )
for (mm in 1:M){
ind.mm <- which( gammaslope.center.index==mm )
IM <- length(ind.mm)
rmm <- gammaslope[ ind.mm ] - mean( gammaslope[ind.mm] )
gammaslope[ ind.mm ] <- gammaslope.center.value[mm] / IM + rmm
}
}
return(gammaslope)
}
.mml.3pl.gammaslope.center <- tam_mml_3pl_mstep_item_slopes_gammaslope_center
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