getVCOV <- function(model,approximate_SEs = FALSE){
if (!is.null(model@information)){
Info <- model@information
} else {
if (model@cpp){
Info <- psychonetrics_FisherInformation_cpp(model)
} else {
Info <- psychonetrics_FisherInformation(model)
}
}
# Attempt to invert:
1/sum(model@sample@groups$nobs) * as.matrix(solve_symmetric(Info,approx=approximate_SEs))
}
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