Abstract
This article investigates the discrepancy between victimization surveys and police data, or the extent to which crimes that are reported in one source can be traced back to the other. We used traditional reverse and forward record checks to investigate reciprocal validity. In addition, we designed a new, more comprehensive measure that is more optimally geared towards calculating the total discrepancy between the two data sources. We used victimization surveys and police data from Amsterdam, The Netherlands. Results of the reverse record check showed that in 48% of cases a survey respondent did not mention victimization, even though it appeared in police registration. Results of the forward record check showed that only 35% of reported victimization in the survey could be traced back to police data within the reference period. Forward telescoping occurred in 28% of cases. In 7% of cases, respondents reported victimization experienced by household members. Furthermore, 29% of victimization reported to the police according to survey respondents could not be traced back to police data. Finally, we calculated the total discrepancy between the police data and the victimization survey and found that reports of 18% of respondents in the victimization survey were not congruent with the police data.
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