On Wed, 18 Jan 2006 14:58:26 +0100, P. Olsson wrote: PO> Dear R helpers, PO> running the following code of a glm model of the family poisson, PO> gives predicted values < 0. Why? PO> PO> library(MASS) PO> library(stats) PO> library(mvtnorm) PO> library(pscl) PO> data(bioChemists) PO> poisson_glm <- glm(art ~ fem + mar + kid5 + phd + ment, data = PO> bioChemists, family = poisson) PO> predicted.values = predict(poisson_glm) PO> range(predicted.values) PO>
use predicted.values = predict(poisson_glm, type="response") best wishes, Adelchi Azzalini <[EMAIL PROTECTED]> Dipart.Scienze Statistiche, Università di Padova, Italia tel. +39 049 8274147, http://azzalini.stat.unipd.it/ ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
