Message-ID: <CADB6tZsOMQBAaa7uQ-7hvUij1syxGddQkm+cUz7GQsyO73KrvA@mail.gmail.com>
Date: 2011-07-12T18:38:55Z
From: Carson Farmer
Subject: Deviance of zeroinfl/hurdle models
Dear list, I'm wondering if anyone can help me calculate the deviance
of either a zeroinfl or hurdle model from package pscl?
Even if someone could point me to the correct formula for calculating
the deviance, I could do the rest on my own.
I am trying to calculate a pseudo-R-squared measure based on the
R^{2}_{DEV} of [1], so I need to be able to calculate the deviance of
the full and null models. Does anyone have any suggestions?
Alternatively, does anyone have a suggestion for a better measure to
report (I'm aware that R^2 measures aren't really appropriate here),
preferably something that is easy enough to program or compute using
existing packages...
Thanks in advance,
Carson
[1] Cameron, A.C., Windmeijer, F.A.G., 1996. R^2 measures for count
data regression models with applications to health-care utilization.
J. Bus. Econom. Statist. 14, 209?220
--
Carson J. Q. Farmer
ISSP Doctoral Fellow
National Centre for Geocomputation
National University of Ireland, Maynooth,
http://www.carsonfarmer.com/