Return any special values or quantities in a fitted object, and in particular in a VGLM fit
specials(object, ...)
specialsvglm(object, ...)Returns any `special' values or quantities associated with a fitted regression model. This is often something simple such as a list or a vector.
an object of class "vglm" whose family function
begins with "gait".
any additional arguments, to future-proof this function.
This extractor function was motivated by GAITD regression
(Yee and Ma, 2023)
where the values from three disjoint sets are referred
to as special.
More generally, S4 methods functions can be written so that
specials() will work on any S4 object, where
what is called special depends on the methodology at hand.
Yee, T. W. and Ma, C. (2023) Generally altered, inflated, truncated and deflated regression. In preparation.
vglm,
vglm-class,
inflated,
altered,
truncated,
Gaitdpois,
gaitdpoisson.
abdata <- data.frame(y = 0:7, w = c(182, 41, 12, 2, 2, 0, 0, 1))
fit1 <- vglm(y ~ 1, gaitdpoisson(a.mix = 0), data = abdata,
weight = w, subset = w > 0)
specials(fit1)
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