I seem to have made myself popular in your correspondence columns by questioning the methodology and results that depend on Regression to the Mean (RTM) for safety camera casualty analysis (Letters LTT 18 Mar).
I read with particular interest the contribution from Professor Maher and I am glad that he raised the example of the GoSafe Welsh camera data. I was able to pick up the paper he wrote explaining his methodology and consider it at some length. In these comments, I leave aside the issue...
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