[Limdep Nlogit List] Error 805 Poisson regression

Thornburg, Steven sthornburg at wsu.edu
Mon Aug 31 07:14:06 EST 2009

Can I get some suggestions 


I'm running random parameters  poisson regressions on panel count data

When I run on the entire sample I get :


Error 805: Initial Iterations cannot improve function. Status 3


Also, the log likelihood function is large -xxx,xxx.x

The full sample runs well under a panel tobit model

Tests of overdispersion are significant


When I run the same model on a subset of the counts

I get successful completion and decent statistics


Any ideas?




Steven Thornburg, Ph.D. CPA

Assistant Professor

Todd 237F

Department of Accounting

Washington State University

Pullman, WA 99164

Voice:  (509) 335-2222

Fax:      (509) 335-4275


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