Some combinations of dimensions, filters, time, and geography may return a small count of trips, which could increase a privacy risk of re-identification. To correct for that, Metrics does not return data below a certain count of results. This data redaction is called k-anonymity, and the threshold is set at a k-value of 10. For more explanation of this methodology, see our [Data Redaction Guidance document](https://github.com/openmobilityfoundation/mobility-data-specification/wiki/MDS-Data-Redaction).
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