Re: [R] Zero inflation model - pscl package

2010-02-25 Thread Achim Zeileis
On Wed, 24 Feb 2010, Nicholas M. Caruso wrote: I have some questions regarding Zero Inflation Poisson models. I am using count data to analyze abundance trends of salamanders. However, I have surveys which differ in the amount of effort (i.e. the number of people searching and amount of time -

[R] Zero inflation model - pscl package

2010-02-24 Thread Nicholas M. Caruso
I have some questions regarding Zero Inflation Poisson models. I am using count data to analyze abundance trends of salamanders. However, I have surveys which differ in the amount of effort (i.e. the number of people searching and amount of time - I am using a museum database so not all surveys w