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Hi Anonymous

You can use this as a measure : 

Moving Average = 
		AVERAGEX(
			DATESINPERIOD(
				'Task Calendar'[Task Date],
				LASTDATE('Task Calendar'[Task Date]) ,
				 -30 , 
				 DAY),
			CALCULATE(sum('YourTable'[Task Count]))
			)

 Maybe the , won't work, replace them with ; (In my version of PBI i need to use ';')

- Quentin