R help - Nov 2010 - first-order integer valued autoregressive process, inar(1)

Hello,

in my doctoral thesis i try to model time series crash count data with  
an inar(1)-process, but i have a few problems in writing the r-code.  
is there someone, who works with inar-processes. i would be very  
grateful, if someone gives me some ideas in writing the code.

nazli