The Analysis of Count Data: Over-dispersion and Autocorrelation

Barron, David (1992) The Analysis of Count Data: Over-dispersion and Autocorrelation. Sociological Methodology, 22. pp. 179-220.

Abstract

I begin this paper by describing several methods that can be used to analyze count data. Starting with relatively familiar maximum likelihood methods-Poisson and negative binomial regression-I then introduce the less well known (and less well understood) quasi-likelihood approach. This method (like negative binomial regression) allows one to model overdispersion, but it can also be generalized to deal with autocorrelation. I then investigate the small-sample properties of these estimators in the presence of overdispersion and autocorrelation by means of Monte Carlo simulations. Finally, I apply these methods to the analysis of data on the foundings of labor unions in the U.S. Quasi-likelihood methods are found to have some advantages over Poisson and negative binomial regression, especially in the presence of autocorrelation.

Item Type: Article
Keywords: sociology; dynamic social processes
Subject(s): Organisational behaviour
Centre: Faculty of Organisational Behaviour
Date Deposited: 18 Nov 2011 11:06
Last Modified: 23 Oct 2015 14:06
URI: http://eureka.sbs.ox.ac.uk/id/eprint/1188

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