[peatmoss]

Watch the video again--geographic aggregation. Summary stats from geo-to-geo.

EDIT: I think in the video they showed census tracts, which is one of many geographic units they could choose from.

[cowsandmilk]

In their trial with Boston, it was limited to zip codes[1]. Cross my finger for census tracts as that would be far more useful.

[1] https://www.boston.com/news/business/2016/06/16/bostons-uber...