VGAM (version 1.1-12)

specials: Special Values or Quantities in a Fitted Object

Description

Return any special values or quantities in a fitted object, and in particular in a VGLM fit

Usage

specials(object, ...)
specialsvglm(object, ...)

Value

Returns any `special' values or quantities associated with a fitted regression model. This is often something simple such as a list or a vector.

Arguments

object

an object of class "vglm" whose family function begins with "gait".

...

any additional arguments, to future-proof this function.

Details

This extractor function was motivated by GAITD regression (Yee and Ma, 2024) 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.

References

Yee, T. W. and Ma, C. (2024). Generally altered, inflated, truncated and deflated regression. Statistical Science, 39 (in press).

See Also

vglm, vglm-class, inflated, altered, truncated, Gaitdpois, gaitdpoisson.

Examples

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)