Abstract

One sees different features from different points of view. Flying over a region provides a view of geographical and geological features not visible from the ground, while ground-level observations show details not apparent from the air. Similarly, different units of analysis applied to crime data can bring out different patterns in crime. This chapter describes how two different units of time, one measured in years, the other in weeks, can be used to extract two different types of geographical patterns. One, the “wave” analysis, traces the actions of whole groups over a long time period. In particular, it should be of use in investigating the effect of in- or out-migration of racial/ethnic groups in neighborhoods in a metropolitan area and the effect that these population shifts have on crime. The “particle” analysis, on the other hand, focuses on the career trajectories of individuals, from an early age, as they experience noteworthy events during their lives and move (or are moved) from place to place in a city. This view of a neighborhood’s at-risk youths can be used to describe the role of residential mobility in crime.

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