RF Quintile Scorer

Sort, bin into five 20% groups (5=best … 1=worst) for Recency and Frequency. Optional Monetary. This is the spreadsheet method that still prints money.

CSVcustomer_id, last_activity_date, frequency, monetary

For continuous power-law scoring, North Star labels, and 3D visuals use the sister RFM suite — same family, deeper ops UI.