So, my analysis yesterday had some error in it. The database software I was using (ArcGIS) had difficulty calculating negative changes in density. The histograms above are right, and the ones below are wrong.The "Marta Stations" histogram now includes all census tracts within 1/2 mile of a Marta station, not just tracts containing a station. This didn't actually change a whole lot. The trend is still mildly negative, but statistically insignificant.
A potential explanation: "density" in this field is purely based on population. Thus if a neighborhood of old, one-story homes is demolished to make way for a bigger development (Edgewood or Atlantic Station, for instance) the density will drop, while the actual activity will increase. Really what I need to do is sum households and jobs in a district, and compute density from that.
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