[R] truncated poisson in glm / glmmPQL
joernfischer at gmx.net
Tue Apr 8 04:00:04 CEST 2003
I'm a postgrad in ecology, and have recently started to use R. I'm planning
to model various sets of animal abundance (i.e. count) data in relation to
habitat data using glm's and/or glmmPQL's. However, some of my potential
response variables have many zeros. From what I gather the "family = ..."
option in the command line does not allow for the direct specification of a
truncated / zero-modified poisson distribution. My problem is probably not
uncommon, but I could not find anything on truncated poisson distributions
in the R web pages or documentation.
Does anyone know of a bit of software that someone may have written to deal
with this problem? I'm interested in modifications to the poisson as well
as quasipoisson families.
Thanks a lot for your help - Joern.
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