Analysis of Transit Operations: Massaging the CIS Data

In a previous post, I introduced the subject of analysing route operations using data from the TTC’s vehicle monitoring system called CIS.

Before I get into comments about any routes, this post is intended as an overview of how the data from CIS works (or doesn’t) and the limitations of any analysis based on it.  In a way, this is a gigantic footnote, but the information here is common to everything that will follow in this series, and I don’t want to spend my time answering questions about how the analysis was actually conducted.

For those of you who just want the gory details on the King car, wait for the next post. Continue reading