A Zero Inflated Poisson Analysis of Spatial Units Created by a GIS: Illegal Drug Sales Arrests

George Rengert, Temple University

ABSTRACT
Moving beyond census boundaries, a geographic information system is used to create new spatial units associated with elements of the built environment that are expected theoretically to attract illegal drug dealers. These features are classified into those that would be associated with the accessibility of a drug market place (transportation infrastructure), the susceptibility of the local population to drug use (census data on potential drug users), and infrastructure that are expected to be used on a routine basis by potential drug users (taverns, liquor stores and check cashing establishments). These new spatial units are examined using a zero inflated Poisson model since many of the spatial units are small and are associated with no drug sales arrests.

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Updated 05/20/2006