Time-series Retention

[shane-kercheval]

Dataset where each person/entity has multiple records, one record for each event (e.g. purchase) with a corresponding event datetime. The goal would be to show retention (e.g. heatmap) for each cohort (e.g. week, month, quarter, year).

When a Date/Time value is selected, need an option for Unique Id (or something, "Retention Id"?)