Nothing
as_vcov <- function(sd, cor) {
x <- diag(rep(1, length(sd)))
x[upper.tri(x)] <- cor
x <- t(x)
x[upper.tri(x)] <- cor
res <- diag(sd) %*% x %*% diag(sd)
res <- as.matrix(Matrix::nearPD(res)$mat)
assertthat::assert_that(isSymmetric(res))
dimnames(res) <- NULL
return(res)
}
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