boot.env <- function(X, Y, u, B) {
X <- as.matrix(X)
a <- dim(Y)
n <- a[1]
r <- a[2]
p <- ncol(X)
fit <- env(X, Y, u, asy = F)
Yfit <- matrix(1, n, 1) %*% t(fit$alpha) + X %*% t(fit$beta)
res <- Y - Yfit
bootenv <- function(i) {
res.boot <- res[sample(1:n, n, replace = T), ]
Y.boot <- Yfit + res.boot
return(c(env(X, Y.boot, u, asy = F)$beta))
}
bootbeta <- lapply(1:B, function(i) bootenv(i))
bootbeta <- matrix(unlist(bootbeta), nrow = B, byrow = TRUE)
bootse <- matrix(apply(bootbeta, 2, sd), nrow = r)
return(bootse)
}
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