Changes

*For Galvanize, the Seattle location is in US Incubators and the San Francisco and New York City locations are both in AngelList.

The three absent incubators all have a university affiliation. AU Entrepreneurship Incubator is based at American University in DC, IncubatorCTX is based at Concordia University in Northwest Austin, and Discovery Launchpad at UMN is at the University of Minnesota. This suggests that we would need another source of data to capture academic incubators. The data also suggests that the different sources do capture different incubators. There is little apparent correlation between the sources, and the Google Crawler is the only one to capture more than half of the incubators.