Dear R users,

 

I have been using the zicounts package (verson 1.1.4) in R (version
2.4.1).  I have been fitting zero inflated  Poisson regressions to model
the number of trips made by a household.   Whilst I can get the best fit
parameter set from zicounts, I can't get the package to return the
fitted values for the model.  I have attempted to calculate the fitted
values from the optimal parameter set, but I'm not confident I got this
correct.  

 

Can zicounts return fitted values for a ZIP model?  If not, what
cumulative distribution should be used for the zero inflated (ie z)
coefficients?  Will a cumulative standard normal distribution do the
job?

 

Many thanks in advance!

 

 

Nic Surawski

Statistician & Data Manager

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Veitch Lister Consulting Pty Ltd. 
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Fax: +61 7 3870 4446 
Email: nic.surawski@veitchlister.com.au
<http://www.veitchlister.com.au/> 

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