Nothing
svydfbetas <- function(mobj, stvar=NULL, clvar=NULL, z=3){
xdat <- mobj$data[, all.vars(mobj$formula)]
X <- model.matrix(mobj$formula, xdat)
w <- mobj$weights
n <- length(w)
p <- length(mobj$coefficients)
e <- mobj$residuals
cutoff <- z / sqrt(n)
XWX <- (t(X) * w) %*% X
Ainv <- ginv(XWX)
h <- svyhat(mobj)
ewh <- e * w / (1-h)
ewh <- matrix(rep(ewh,p), ncol=p, byrow=FALSE)
Dfbeta <- Ainv %*% t(X * ewh)
SEbeta <- sqrt(diag(mobj$cov.unscaled))
SEbeta <- matrix(rep(SEbeta,n), ncol=n, byrow=FALSE)
Dfbetas <- Dfbeta / SEbeta
if (!is.null(clvar)){
tmp <- svystdres(mobj, stvar, clvar)
cutoff <- z / sqrt(tmp$n * (1 + (tmp$mbar-1)*tmp$rhohat))
}
DFBETAS <- list(Dfbeta = Dfbeta,
Dfbetas = Dfbetas,
cutoff = cutoff)
DFBETAS
}
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