Nothing
u.sxenv <- function(X, Y, R){
X <- as.matrix(X)
a <- dim(Y)
n <- a[1]
r <- a[2]
p <- ncol(X)
q <- length(R)
loglik.seq <- unlist(lapply(0:p, function(x) sxenv(X,
Y, x, R, asy = F)$loglik))
npara.seq <- r * (0:p) + r + p + q - 1 + p * (p + 1)/2 + r * (r + 1)/2
aic.seq <- -2 * loglik.seq + 2 * npara.seq
bic.seq <- -2 * loglik.seq + log(n) * npara.seq
u.aic <- which.min(aic.seq) - 1
u.bic <- which.min(bic.seq) - 1
if (min(aic.seq) == aic.seq[p+1]) {
u.aic = p
u.bic = p
}
return(list(u.aic = u.aic, u.bic = u.bic, aic.seq = aic.seq,
bic.seq = bic.seq))
}
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