Nothing
## File Name: gom_em_numdiff_index.R
## File Version: 0.15
#--- general function for numerical differentiation
#--- diffindex aggregates across super items
gom_em_numdiff_index <- function( pjk, pjk1, pjk2, an.ik, diffindex,
max.increment, numdiff.parm, eps=1e-5 )
{
h <- numdiff.parm
ll0 <- rowSums( an.ik * log(pjk+eps) )
ll1 <- rowSums( an.ik * log(pjk1+eps) )
ll2 <- rowSums( an.ik * log(pjk2+eps) )
#- derivatives
res <- rasch_mml2_difference_quotient(ll0=ll0, ll1=ll1, ll2=ll2, h=numdiff.parm)
d1 <- res$d1
d2 <- res$d2
increment <- - d1 / d2
increment <- sirt_trim_increment(increment=increment, max_increment=max.increment)
#-- output
res <- list(increment=increment, d2=d2, d1=d1, ll0=ll0)
return(res)
}
.gom.numdiff.index <- gom_em_numdiff_index
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.