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

From: Johan Kotze <kotze_at_mappi.helsinki.fi>
Date: Tue 31 May 2005 - 22:41:36 EST

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@helsinki.fi

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

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Received on Tue May 31 22:48:00 2005

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