Has a Fitted VGLM Got an Intercept Term?
Looks at the formula to
see if it has an intercept term.
has.intercept(object, ...) has.interceptvlm(object, form.number = 1, ...)
object |
A fitted model object. |
form.number |
Formula number, is 1 or 2.
which correspond to the arguments |
... |
Arguments that are might be passed from one function to another. |
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.
Returns a single logical.
Thomas W. Yee
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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