What does the Project Sample Size Metric represent?

Sample Size Metrics .csv files are automatically available for Projects. These sample size estimates are calculated differently for our different data sources:

  • For Navigation-GPS data: Sample size indicates the number of unique vehicle trips in the StreetLight Data database that were analyzed for the Project and its Data Period. A trip is only counted in the sample size if it meets all of the parameters defined both in the Project Options and the Zone Set structure (i.e.: for Pass-Through Zones, only trips that pass through those Zones are included).
  • For Location-Based Services data: Device counts and trip counts are included in sample size .csv downloads for Projects that use either our Location-based Services or our Location-based Services with Pass-through data sources. These counts represent the approximate number of unique devices and trips analyzed for the Project.
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