Model Formulae and Term Names for VGLMs
The methods function for formula to
extract the formula from a fitted object,
as well as a methods function to return the names
of the terms in the formula.
## S3 method for class 'vlm' formula(x, ...) formulavlm(x, form.number = 1, ...) term.names(model, ...) term.namesvlm(model, form.number = 1, ...)
x, model |
A fitted model object. |
form.number |
Formula number, is 1 or 2.
which correspond to the arguments |
... |
Same as |
The formula methods function is
based on formula.
The formula methods function should return something similar to
formula.
The term.names methods function should return a character string
with the terms in the formula; this includes any intercept (which
is denoted by "(Intercept)" as the first element.)
Thomas W. Yee
# 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) vglm.D93 <- vglm(counts ~ outcome + treatment, family = poissonff) formula(vglm.D93) 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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