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#' Returns MIs from lavaan fit object.
#' @param fit An object from lavaan.
#' @return If successful, returns MIs for an individual. If unsuccessful,
#' returns NA.
#' @keywords internal
return.mis <- function(fit, elig_paths){
zero_se <- FALSE
no_paths <- FALSE
error <- inherits(fit, "try-error")
if (!error){
no_paths <- sum(lavInspect(fit, "free")$beta, na.rm = TRUE) == 0
}
if (!error & !no_paths){
zero_se <- sum(lavInspect(fit, "se")$beta, na.rm = TRUE) == 0
}
if (!error & !zero_se){
#commented out by lan 4.11.2019
#mis <- tryCatch(modindices(fit, op = "~",
# standardized = FALSE,
# sort. = FALSE),
# error = function(e) e)
#
lanMod <- function(fit, elig_paths){
mis0 <- modindices(fit, standardized = FALSE, sort. = FALSE)
mis0_idx <- paste0(mis0$lhs,mis0$op,mis0$rhs)
mis <- mis0[mis0_idx %in% elig_paths,]
return(mis)
}
mis <- try(lanMod(fit, elig_paths))
error <- inherits(mis, "try-error")
if (error) mis <- NA
} else {
mis <- NA
}
return(mis)
}
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