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## File Name: regpolca_run_xxirt_random_starts.R
## File Version: 0.151
regpolca_run_xxirt_random_starts <- function(args, random_starts, sd_noise_init,
par_item_init=NULL)
{
partable1 <- partable <- args$partable
customTheta1 <- customTheta <- args$customTheta
NR <- nrow(partable)
CP <- length(customTheta$par)
opt0 <- Inf
partable_opt <- NULL
par_Theta_opt <- NULL
rr_opt <- NULL
if (!is.null(par_item_init)){
args$partable$value <- par_item_init
}
if (random_starts>0){
for (rr in 1L:random_starts){
fac_rr <- sqrt(rr-1)
sd_rr <- sd_noise_init*fac_rr/random_starts
partable1$value <- partable$value + partable$est*stats::rnorm(NR, sd=sd_rr)
args$verbose_index <- paste0('Random start ',rr)
args$partable <- partable1
customTheta1$par <- customTheta$par + stats::rnorm( CP, sd=sd_rr )
args$customTheta <- customTheta1
cat(paste0( '*** Random start ', rr, ' ***'), '\n')
mod <- do.call(what=xxirt, args=args)
par_Theta0 <- mod$customTheta$par
partable0 <- mod$partable
opt_val <- mod$opt_val
if (opt_val < opt0){
opt0 <- opt_val
par_Theta_opt <- par_Theta0
partable_opt <- partable0
rr_opt <- rr
}
}
partable1$value <- partable_opt$value
args$partable <- partable1
customTheta1$par <- par_Theta_opt
args$customTheta <- customTheta1
}
return(args)
}
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