Please any one who can help, i have count data which have many zero and variance larger than mean. I need to applyZero inflated generalized poisson regression. I have installed the ZIGP package but I failed to implement. My file look loke count Species treatment 1 duiker pollarding . . . . . . n n pushover tree I am looking forward to you response Cheers Edward -- View this message in context: http://www.nabble.com/Implementation-of-ZIGP-in-R-tp22540658p22540658.html Sent from the R help mailing list archive at Nabble.com.