DAX code
Lost Customers =
VAR CurrentCustomers = VALUES('Sales'[CustomerID])
VAR PriorCustomers = CALCULATETABLE(VALUES('Sales'[CustomerID]), SAMEPERIODLASTYEAR('Date'[Date]))
RETURN
COUNTROWS(EXCEPT(PriorCustomers, CurrentCustomers))DAX Lost Customers Measure
Counts customers who purchased in the previous period but have no purchases in the current period.
My table names
Type your table and column names once. Every measure below updates.
Notes
Swap SAMEPERIODLASTYEAR for a different offset (e.g. PARALLELPERIOD by month) to compare shorter periods.
Requirements
- A marked Date table and a customer ID column on the fact table.
How to use this measure
- In Power BI Desktop, select the table that should hold the measure and choose New measure on the ribbon.
- Paste the code, then replace the placeholder table and column names with your own. The My table names fields above do this for you.
- Run it through the DAX Formatter if you want it laid out in your team's style.
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