#' Get V matrix for merMod objects
#'
#' Function to extract V matrix.
#'
#'
#' @param x lme4 object
#' @return V matrix (weight) for multilevel models
#' @export
#' @importFrom stats sigma
getV <- function(x) {
lam <- data.matrix(getME(x, "Lambdat"))
var.d <- crossprod(lam)
Zt <- data.matrix(getME(x, "Zt"))
vr <- sigma(x)^2
var.b <- vr * (t(Zt) %*% var.d %*% Zt)
sI <- vr * diag(nobs(x))
var.y <- var.b + sI
}
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