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st: question on zero inflated regression

From   rachel grant <>
Subject   st: question on zero inflated regression
Date   Sun, 13 Feb 2011 18:58:22 +0000

Hi I am new to the list and pretty clueless.
I am trying to use Zero inflated models, my data are counts of
ampibians arriving at a breeding site per night. Most nights none
arrive or one,  but some nights many arrive hence the data are
overdispersed and have excess zeroes. I am using zero inflated
negative binomial regression. What I am confused about is I have to
specify the inflation variable (ie the one that is generating the
excess zeroes). I have 7 predictor variable and have no clue which is
responsible for generating the zeroes, so what to put into the model
as the inflation variable? Thanks for reading this

regards, Rachel

Rachel Grant
Dept. Life Sciences
Open University

regards, Rachel

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