Testing the Impact of Group Offending on Behavioural Similarity in Serial Robbery

Amy Burrell, Ray Bull, John Bond, Gary Herrington

Research output: Contribution to journalArticle

3 Citations (Scopus)
45 Downloads (Pure)

Abstract

Behavioural case linkage assumes that offenders behave in a similar way across their crimes. However, group offending could impact on behavioural similarity. This study uses robbery data from two police forces to test this by comparing the behavioural similarity of pairs of lone offences (LL), pairs of group offences (GG) and pairs of offences where one crime was committed alone and the other in a group (GL). Behavioural similarity was measured using Jaccard's coefficients. Kruskal–Wallis tests were used to examine differences between the three categories within the linked samples. No statistically significant differences were found for linked GG compared to linked LL pairs. However, differences emerged between GL and the other categories for some behaviours (especially control) suggesting caution should be applied when linking group and lone offences committed by the same perpetrator. Differences between linked and unlinked pairs were assessed using receiver operating characteristic. The results suggest it is possible to distinguish between linked and unlinked pairs based on behaviour especially within the GG and LL categories. There were, however, fewer significant findings for the GL sample, suggesting there may be issues linking crimes where the offender commits one crime as part of a group and the other alone.
Original languageEnglish
Pages (from-to)551-569
Number of pages19
JournalPsychology, Crime & Law
Volume21
Issue number6
Early online date17 Dec 2014
DOIs
Publication statusPublished - 19 Jan 2015

Bibliographical note

This is an Accepted Manuscript of an article published by Taylor & Francis in Psychology, Crime and Law on 17th of December 2014, available online: http://www.tandfonline.com/10.1080/1068316X.2014.999063

Keywords

  • case linkage
  • robbery
  • group offending
  • serial
  • behavioural similarity

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