British victimization studies understate crime rates
It turns out the British crime victimization survey, the British Crime Survey, has since its inception had an artificial cap: no one may report having been a victim of more than five crimes in a year. Victimization No. 6 and beyond are simply discarded.
One might think that'd not have a big influence -- but a study by Professor Graham Farrell of Loughborough University finds that it means the real violent crime rate is 82% higher than what is being reported -- 4.4 million incidents per year rather than 2.4. That comes just from adding back in people who are being victimized 5+ times a year!
"In particular, the system means that the most vulnerable people in society may not be getting the police protection they require from repeat offenders, the report said."
[Hat tip to Dan Gifford]