What does the value 9999999 in the ORIGIN_AREA_ID and rank fields represent?
In the ORIGIN_AREA_ID field, 9999999 is used to aggregate origins with very low percent population values in order to reduce a long tail of origins. The value is applied only after the cumulative sum of percent population surpasses 90% and the remaining origins contribute less than 1% each.
Is there a minimum number of mobility device transactions for an area that can be used in a dataset?
Yes. Every aggregation in the dataset must contain a minimum of 10 data points. However, by utilizing 3 months of data in all calculations and applying the >10 point minimum filter, Precisely reduces the risk of individual device origin-destination results for a location being introduced into the dataset.