Relevant XKCD: https://xkcd.com/605/ https://xkcd.com/605/ Extrapolating from a single neighbourhood to an entire city is not valid reasoning. Perhaps the ne

Relevant XKCD: https://xkcd.com/605/ https://xkcd.com/605/ Extrapolating from a single neighbourhood to an entire city is not valid reasoning. Perhaps the neighbourhood was especially amenable to the program, perhaps the crime rate failed to stay low, perhaps some extra-judicial phenomena struck that particular area (say a new factory opening up that boosted the local economy significantly). Or coming at it from the other angle, who's to say New York hasn't had one or two of its neighbourhoods experience extreme marked drops in crime year-over-year too? The 75% over a decade figure is an aggregate for the entire city, and surely it's going to have happened faster in some areas and slower in others. Only by comparing apples to apples, or in this case cities to cities, and not just for a single year but over many years can we reach valid conclusions. And in that case we find the VRU approach in Glasgow failed to out perform the null hypothesis.