Nothing
vcov.BinaryEPPM <-
function (object, model = c("full", "p", "scale.factor"), ...) {
vc <- object$vcov
k <- length(object$coefficients$p.est)
m <- length(object$coefficients$scalef.est)
match.arg(model)
if (missing(model)) { model <- c("full") }
# Checking for correct model option
if ((model!="full") & (model!="p") & (model!="scale.factor")) {
warning("\n","unknown model option")
vc <- NULL
} else {
switch(model, full = { vc
}, p = {
vc <- vc[seq.int(from = 1, to = k, by = 1),
seq.int(from = 1, to = k, by = 1), drop = FALSE]
}, scale.factor = {
if (m==0) { warning("\n","the scale-factor model has no elements")
vc <- NULL
} else {
vc <- vc[seq.int(length.out = m) + k, seq.int(length.out = m) +
k, drop = FALSE]
colnames(vc) <- rownames(vc) <- names(object$coefficients$scalef.est)
vc }} ) } # end of if model!="full", etc.,
return(vc) }
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