Abstract
This synthesis will be of interest to transit agency managers, their schedule and operations planning staff, and others who are responsible for information about system operations and ridership. It will also be of interest to others who interact with transit agencies in the reporting of operations data in order to support regular scheduling and operations planning activities for monitoring trends, and for reporting to oversight agencies. This synthesis reviews the state of the practice in how data are analysed. It addresses methods used to analyse data and what computer systems are used to store and process data. It also covers accuracy issues, including measurement error, and other problems, including error in estimates. (A)