Archive for the 'maps' Category

And We’re Back

Despite the lack of activity on this blog, the Chicago Crime Project has been ongoing.  Specifically, I have continued to collect dataand have been improving the method of interpreting the data.  As you may have noticed, the data we were dealing with before was all aggregate (i.e the total amount of various crimes in various areas), which is fine as far as it goes (and when we only had six months of data).  Now, however, I have two years of data and the time is here to start doing fund and informative things with time series.  There will be day to day charts on all manner of issues as we move forward.  First, however, is an update of the famous violent crime and property crime maps.  They are not only more readable and visually pleasing than the old ones, but I have abandoned the relative ranking I used to do (i.e. the 10 best neighborhoods are one color, the next 10 best another, and so on) and have adopted absolute ranking (i.e. neighborhoods below x crimes per capita are one color, neighborhoods above x but below 2x crimes per capita are another, and so forth).  This, I believe, will give a more accurate picture of crime in the city.  Note that violent crime has a more fine-grained spectrum than property crime.  This is because, for better or worse, there is a much richer and varying fabric of violent crime than property crime in this city.  I have also tweaked slightly the formula I use to calculate the Violent Crime Index.  More on this later.  Now, the maps:




Updated Violent Crime Map (plus BONUS Property Crime Map)

Thanks first to our small but helpful commentariat.  Just because your suggestions have not been acted upon does not mean they are (entirely) without merit.  We have been busy actually updating data and running regressions.  Expect more substantive posts soon, but, in the meantime, please enjoy an updated version of the previously posted violent crime map as well as a similar one for property crimes.  You will note that I replaced the green color with tan to make it more intuitive (and visually pleasing).  Again, lower ranked areas have less crime.






Update (12/14/2008):  Minor corrections made to violent crime map.  7 Community Areas move up or down one category from previous map.