Estimating the Size of a Criminal Population from Police Records Using the Truncated Poisson Regression Model

Peter G.M. Van Der Heijden, Maarten Cruyff and Hans C. Van Houwelingen

Statistica Neerlandica, 2003, vol. 57, issue 3, 289-304

Abstract: The truncated Poisson regression model is used to arrive at point and interval estimates of the size of two offender populations, i.e. drunk drivers and persons who illegally possess firearms. The dependent capture–recapture variables are constructed from Dutch police records and are counts of individual arrests for both violations. The population size estimates are derived assuming that each count is a realization of a Poisson distribution, and that the Poisson parameters are related to covariates through the truncated Poisson regression model. These assumptions are discussed in detail, and the tenability of the second assumption is assessed by evaluating the marginal residuals and performing tests on overdispersion. For the firearms example, the second assumption seems to hold well, but for the drunk drivers example there is some overdispersion. It is concluded that the method is useful, provided it is used with care.

Date: 2003
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