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One other potential problem with the data is, I guess, a form of selection bias -- that is, the first 30 minutes of any CaBi ride are free, so it behooves riders to keep their ride under 30 minutes. Even if their destination is farther away, there is no penalty (unless it's new) for returning a bike, immediately taking out another and having a new 30 minute free period.

I don't know how popular this tactic is (I used it all over Paris), but it would artificially shorten CaBi trips even more than you are seeing with the lack of walk data.

As for the walk data, could you use the median of the assumed range-of-use for each station as a rough proxy? It's rough, but might at least give a good idea about the impact.

by Elle on Jun 13, 2012 2:52 pm • link • report

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