vcovx | R Documentation |
An extension to the vcov
function mainly to
cover the additional parameter involved in negative binomial models.
(Currently the same as vcov
apart from negative binomial models.)
vcovx(object, ...) ## Default S3 method: vcovx(object, ...) ## S3 method for class 'negbin' vcovx(object, ...)
object |
A fitted mdel objeds |
... |
currently ignored |
An extended variance matrix including parameters addition to the regression coefficients
fm <- glm.nb(Days ~ Sex/(Age + Eth*Lrn), quine) Sigma <- vcovx(fm)
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