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57 Crime & Delinquency 3 (2011)

handle is hein.journals/cadq57 and id is 1 raw text is: Article A Life-Course Analysis of Offense Specialization Across Age: Introducing a New Method for Studying Individual Specialization Crime & Delinquency 57(l) 3-28 @ 2011 SAGE Publications DOI: 10.1177/0011128710376336 http://cad.sagepub.corn SAGE Over the Life Course Paul Nieuwbeerta', Arjan A.J. Blokland2, Alex R. Piquero3, and Gary Sweeten4 Abstract Much of the knowledge base on offense specialization indicates that, although there is some (short-term) specialization, it exists amidst much versatility in offending. Yet this general conclusion is drawn on studies using very different conceptualizations of specialization and emerges with data primarily through the first two to three decades of life. Using data on a sample of Dutch offend- ers through age 72 years, this article introduces and applies a new method for studying individual offender specialization over the life course. The results indicate that although, in general, individual offending patterns over the life course are diverse, there is also evidence of an age-diversity curve. Linking offense frequency trajectories to the estimated diversity index, the authors also examine distinct specialization patterns across unique trajectory groups. Implications for theory and research are outlined. 'Leiden University, Leiden, Netherlands 2Netherlands Institute for the Study of Crime and Law Enforcement, Amsterdam, Netherlands 3Florida State University, Tallahassee, FL, USA 4Arizona State University, Glendale, AZ, USA Corresponding Author: Alex R. Piquero, College of Criminology & Criminal justice, Florida State University, 634 W. Call Street, Tallahassee, FL 32306-1127, USA Email: apiquero@fsu.edu

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