[R] Deviance in Zero inflated models
Achim.Zeileis at uibk.ac.at
Thu Apr 4 09:17:11 CEST 2013
On Wed, 3 Apr 2013, Lia McKinnon wrote:
> Dear list,
> I am running some zero inflated models and would like to know what the
> deviance of the models. Unlike running a normal GLM where the deviance
> is displayed in the summary all that is displayed in a summary of the
> zero inflated model is the log likelihood.
Zero-inflated models are not associated with a deviance in the GLM sense.
They are a mixture of two models rather than a single model from an
Hence, zeroinfl/hurdle in "pscl" reports the log-likelihood but not the
deviance. Possibly -2 times the likelihood is useful for you - as Ben
already pointed out.
> I hope this isn't a read the manual question, and if it is I apologize
> for wasting your time, but if you could still send me a link of where I
> might find this information I would be very grateful!
> Thank you
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