Percentage change of an average month-to-month?

[Trudgeon]

Hello... I've created a measure that calculates the average number of days it takes customer to pay us.  When I put that into a matrix, I can see it by customer and month (image below).  Note: each customer can have multiple invoices per month with difference days to payment, so it needs to be an average measure.

Now, I'm looking to calculate the percentage change between months.  In the example below, the top row would show -2.38% for October...the reduction from 63 days to 61.50 (-1.5/63).  The end goal being to show any large anomalies in payment behavior.

Any help would be appreciated.  Thanks! 

[gabbyvb]

Hi, were you ever able to find a solution to this problem?

[Trudgeon]

Hello @gabbyvb .  Unfortunately, I was never able to find an adequate solution.  

[mahoneypat]

You can try this approach

New Measure = AVERAGEX(VALUES(Table[Invoice ID]), [Your Avg Measure])

Pat