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 of the four absent incubators 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 fourth missing incubator is the branch office of a chain. This chain does not describe itself as an incubator but appears to meet the criteria for one. We could attempt to put together data on incubator chains and their offices separately. 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.