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chisqNull <- function(object){
UseMethod("chisqNull")
}
chisqNull.objectiveML <- function(object){
chisq <- if (!object$raw) {
S <- object$S
CC <- diag(diag(S))
(object$N - 1) *
(sum(diag(S %*% solve(CC))) + log(det(CC)) - log(det(S)) - object$n)
}
else NULL
chisq
}
chisqNull.objectiveGLS <- function(object){
chisq <- if (!object$raw) {
S <- object$S
CC <- diag(diag(S))
SS <- solve(S) %*% (S - CC)
(object$N - 1)*0.5*sum(diag(SS %*% SS))
}
else NULL
chisq
}
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