[R] Zelig: starting values for negbin

From: Mikkel Grum <mi2kelgrum_at_yahoo.com>
Date: Thu 02 Jun 2005 - 04:15:36 EST


I'm running a negative binomial model in zelig and it's asking me to supply starting values for the coefficients. How do I supply these? Could I use the coefficients from the poisson model (which runs smoothly)?

> z.out <- zelig(postSpmtsQ ~ (ante62Q + ante08Q +
ante29Q + ante16Q) * Trt, model = "negbin", data = sprayS)
Error: no valid set of coefficients has been found: please supply starting values

I don't find anything on this in the documentation and would appreciate any hints.

Mikkel                 


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