I shouldn’t be surprised that for any interesting technical idea, XKCD covered it first, and better. Here is another view of the issue we covered regarding crime mapping: crime is most common where (a) there are a lot of people and (b) there is alcohol, and (b) is often the reason for (a).



To go ahead and ruin the joke with over analysis, the maps in the cartoon aren’t exactly the same. So, it might be interesting to subtract them from each other and explore the differences.