[Rd] How do I know if the deviance of a glm fit was fixed?

[Duncan Murdoch]

I'm writing functions that need to behave differently for
GLMs like binomial and Poisson with fixed deviance, and those like
normal or gamma or quasi where the deviance is estimated from the
data.  Given a glm object, is there a simple way to tell this
directly, or do I have to look at the name of the family?

Duncan Murdoch
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