VGAM: is.zero – R documentation

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is.zero

Zero Constraint Matrices

Description

Returns a logical vector from a test of whether an object such as a matrix or VGLM object corresponds to a 'zero' assumption.

Usage

is.zero.matrix(object, ...)
is.zero.vglm(object, ...)

Arguments

`object`	an object such as a coefficient matrix of a `vglm` object, or a `vglm` object.
`...`	additional optional arguments. Currently unused.

Details

These functions test the effect of the zero argument on a vglm object or the coefficient matrix of a vglm object. The latter is obtained by coef(vglmObject, matrix = TRUE).

Value

A vector of logicals, testing whether each linear/additive predictor has the zero argument applied to it. It is TRUE if that linear/additive predictor is intercept-only, i.e., all other regression coefficients are set to zero.

No checking is done for the intercept term at all, i.e., that it was estimated in the first place.

Examples

coalminers <- transform(coalminers, Age = (age - 42) / 5)
fit <- vglm(cbind(nBnW,nBW,BnW,BW) ~ Age, binom2.or(zero = NULL), coalminers)
is.zero(fit)
is.zero(coef(fit, matrix = TRUE))

VGAM

Vector Generalized Linear and Additive Models

v1.1-5

GPL-3

Authors

Thomas Yee [aut, cre], Cleve Moler [ctb] (author of several LINPACK routines)

Initial release

2021-01-13