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This measure calculates the running max/min/average (depending on your requirement) of a running total based on the dynamic date range selected.
To recap, here is the Running Total quick measure that Power BI gives us. A measure like this should be be present in your model.
Running Total := CALCULATE( 'Sales'[Amount], FILTER( ALLSELECTED('Date'[Date]), ISONORAFTER('Date'[Date], MAX('Date'[Date]), DESC) ) )
Below is an example of how to set up a running MAX of the running total shown above:
Max of Running Total := VAR __INTERIM_CALC = ADDCOLUMNS ( SUMMARIZE ( ALLSELECTED ( 'Date' ), 'Date'[Date] ), "__RunningTotal", [Running Total] ) RETURN MAXX ( FILTER ( __INTERIM_CALC, ISONORAFTER ( 'Date'[Date], MAX ( 'Date'[Date] ), DESC ) ), [__RunningTotal] )
To find the running average/minimum/etc. of the running total, just change the MAXX in the above query to AVERAGEX, MINX, or another AGGX function.