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Looks at the formula to
see if it has an intercept term.
has.intercept(object, ...)
has.interceptvlm(object, form.number = 1, ...)Returns a single logical.
A fitted model object.
Formula number, is 1 or 2.
which correspond to the arguments formula
and form2 respectively.
Arguments that are might be passed from one function to another.
Thomas W. Yee
This methods function is a simple way to determine whether a
fitted vglm object etc. has an intercept term
or not.
It is not entirely foolproof because one might suppress the
intercept from the formula and then add in a variable in the
formula that has a constant value.
formulavlm,
termsvlm.
# Example: this is based on a glm example
counts <- c(18,17,15,20,10,20,25,13,12)
outcome <- gl(3, 1, 9); treatment <- gl(3, 3)
pdata <- data.frame(counts, outcome, treatment) # Better style
vglm.D93 <- vglm(counts ~ outcome + treatment, poissonff, data = pdata)
formula(vglm.D93)
term.names(vglm.D93)
responseName(vglm.D93)
has.intercept(vglm.D93)
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