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While the 1% of trips might be randomly generated, the full sample is not random. As I'm understanding this, self-selection bias isn't mentioned.

In other words, there's not going to be a data point for my trips from Farragut West to Tenleytown, because I chose Metro for those trips instead of CaBi.

It's not at all surprisingly that most of the points on the scatter-plot fall into the "CaBi is faster" half because people pick to use CaBi when they know it is faster...

by Rob P on Jun 13, 2012 2:38 pm • link • report

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