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Is regression to the mean relevant to speed cameras?

Richard Butchart, Hitchin, Hertfordshire SG4
08 January 2016
 

I would like to thank Mike Maher for his explanation of  the regression to mean (RTM) concept that has emerged in the discussions of safety camera performance (‘If we want safer roads, we need higher standards in casualty data analysis,’ Viewpoint, LTT 11 Dec 15). The two examples he gives – “tall fathers” and “leaders after two rounds of a golf tournament” – are both eminently sensible, based as they are on relevant population means. In the...

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