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Returns a logical vector from a test of whether an object such as a matrix or VGLM object corresponds to a 'zero' assumption.
is.zero.matrix(object, …)
is.zero.vglm(object, …)additional optional arguments. Currently unused.
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.
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).
# NOT RUN {
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))
# }
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