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Advocate of speed cameras misunderstood the data

Idris Francis, Petersfield, Hampshire GU32
05 February 2016
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It is unfortunate that Dr Butchart’s newly-found understanding of Regression to Mean (RTM) does not extend to the long and variable delays between site selection periods (SSP) and installation that result in significant selection bias many years before installation (Letters LTT 22 Jan, repeated as figure one). 

It is important to understand trends: accidents being accidents, their numbers vary a great deal year-on-year by police area, within each area and by speed limit. However, the...

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