[R] Theta and clumping (or aggregation) parameter k

Johan Kotze kotze at mappi.helsinki.fi
Tue May 31 14:41:36 CEST 2005

Hi all, in R the glm.nb models return a theta value, the aggregation
parameter for negative binomial distributions. Crawly in his S-Plus book
talks about the clumping (aggregation) parameter k. Are these two things
(theta and k) different, and if so, what would be the relationship between
the two?

Thank you in advance, 
Johan Kotze
Department of Biological and Environmental Sciences
PO Box 65 (Biocenter 3, Viikinkaari 1)
FI-00014, University of Helsinki
Helsinki, FINLAND
Tel: +358 (0)9 191 57707  Fax: +358 (0)9 191 57694
E-mail: johan.kotze at helsinki.fi

Editor-in-Chief, Journal of Negative Results - EEB (www.jnr-eeb.org)

More information about the R-help mailing list