Nothing
## glmscore.R
glm.scoretest <- function(fit, x2, dispersion=NULL)
# Score test for new covariate in glm
# Gordon Smyth
# 27 March 2009. Last modified 20 Mar 2010.
{
w <- fit$weights
r <- fit$residuals
if(any(w <= 0)) {
r <- r[w>0]
x2 <- x2[w>0]
w <- w[w>0]
}
if (is.null(dispersion)) {
fixed.dispersion <- (fit$family$family %in% c("poisson","binomial"))
if(fixed.dispersion)
dispersion <- 1
else if(fit$df.residual > 0) {
dispersion <- sum(w*r^2)/fit$df.residual
} else {
stop("No residual df available to estimate dispersion")
}
}
ws <- sqrt(w)
x2.1w <- qr.resid(fit$qr,ws*x2)
zw <- ws*r
colSums(as.matrix(x2.1w*zw))/sqrt(colSums(as.matrix(x2.1w * x2.1w)))/sqrt(dispersion)
}
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