Regression to Mean

This section will explain how regression to the mean, the natural tendency of most changing parameters to revert to their long term trends after a disturbance, in fact accounts for most of the observed falls in casulties after a speed camera – or for that matter a garden gnome – is installed at the side of the road.

My analysis of 6m accidents is well on the way to clarifying the extent of this effect and how it varies across the country and across different types of roads.


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