One thing to be careful of when comparing crime rates across cities. @LessCrime

One thing to be careful of when comparing crime rates across cities: the crime rate in a city depends quite a

lot on how widely the city’s boundaries happen to have been drawn (usually decades ago by administrators/politicians who weren’t thinking about crime at all).

Three maps of robberies in London, showing that the apparent rate of robbery in a city depends a lot on how widely the city's administrative boundaries are drawn. Robberies are more common in inner-city areas and less common in suburbs, so the rate of robberies in London as a whole depends partly on the boundaries chosen by government in the 1970s – the wider the boundaries, the lower the apparent robbery rate. If the outer-most 5km of London is excluded, the robbery rate in 'London' increases from 8.6 per 1,000 residents to 10.2. Conversely if you add the 5km of land immediately outside the London boundary, the apparent robbery rate falls to 7.8 robberies per 1,000 residents.

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