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British Journal of Criminology Advance Access published online on July 1, 2009
British Journal of Criminology, doi:10.1093/bjc/azp043
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The British Journal of Criminology 0:azp043 (2009)
© The Author 2009. Published by Oxford University Press on behalf of the Centre for Crime and Justice Studies (ISTD). All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

The Impact of Co-Offending

Martin A. Andresen* and Marcus Felson

* PhD, School of Criminology, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada; andresen{at}sfu.ca. This work was carried out in the ICURS Laboratory at Simon Fraser University under terms of a joint Memorandum of Understanding between the Institute for Canadian Urban Research Studies, Simon Fraser University, ‘E’-Division of the Royal Canadian Mounted Police and the British Columbia Ministry of Public Safety and Solicitor General.


  Abstract

Co-offending has a major impact on the arithmetic of crime rates and the burdens on the justice system. This paper studies co-offending by single year of age using data that comprise 750,000 negative police contacts (those charged, chargeable and suspected in criminal offenses) in a largely metropolitan dataset from British Columbia, Canada, 2002–06. We find that shifts in co-offending rates within teenage years are extremely rapid and highly sensitive to sample age ranges, such that a single co-offending rate for all teenagers is misleading. Co-offending opens a range of policy options and issues concerning the presence of youth hangouts and offender convergence settings that can assist the search for suitable co-offenders.

Key Words: co-offending • group offending • age-crime • juvenile and adult delinquency • estimation • measurement


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