Empirical Investigation of the Dark Figure of Crime in Nigerian Urban Neighbourhoods

The dark figure of crime, representing the gap between actual crime occurrences and officially recorded incidents, is a fundamental measurement problem in criminology, and its empirical characterisation in Nigerian urban contexts is essential for accurate crime policy development. This study empirically investigated the dark figure of crime through victimisation survey methodology in Lagos, Kano, and Enugu, comparing survey-reported victimisation rates with official police crime statistics. A cross-sectional victimisation survey modelled on the International Crime Victims Survey was administered to 450 households (150 per city) using stratified random sampling. Survey-recorded victimisation rates were compared with NPF state command crime statistics for the same year and population base using ratio calculations. Results showed that survey-recorded victimisation rates exceeded official police statistics by a factor of 4.7 in Lagos, 6.3 in Kano, and 5.1 in Enugu across all crime categories combined. The dark figure was highest for sexual violence (official statistics capturing an estimated 4.2 percent of survey-reported incidents), domestic violence (official statistics capturing 7.8 percent), and property crime (official statistics capturing 31.4 percent). Robbery showed the smallest dark figure (official statistics capturing 48.7 percent). Non-reporting reasons followed expected patterns, with police ineffectiveness as the dominant barrier across all cities. The study provides the first dark figure estimation data for multiple Nigerian cities and recommends victimisation surveys as a mandatory complement to official crime statistics in national crime monitoring.

Keywords: dark figure of crime, victimisation survey, official crime statistics, Nigeria, crime measurement