calculting rolling wages / sales ratio (3mth)

[ScottPat]

I have a couple of tables linked like below

Dates
links to SOHeader (on field [trans_date])
links to SOline [on SO_no)

so line has [sales]

Dates
links to GLTransactions (on field [trans_date])
GLTransactions has [wages]

I am trying to get a measure for a graph which is

3 mths rolling average wages / 3 mth rolling average sales

which I would just graph against time (the date on the dates table)

and where should the measure exist? on the date table?

[ScottPat]

Thanks,

that got me to the solution.

[amitchandak · Accepted solution]

@ScottPat , With help from date table you have to create measure like

3 Month Avg = CALCULATE(AverageX(Values('Date'[MONTH Year]),calculate(Sum('Table'[Value])))
,DATESINPERIOD('Date'[Date ],MAX('Date'[Date ]),-3,MONTH))

Rolling Months Formula: https://youtu.be/GS5O4G81fww

Power BI Window function Rolling, Cumulative/Running Total, WTD, MTD, QTD, YTD, FYTD: https://youtu.be/nxc_IWl-tTc
https://medium.com/@amitchandak/power-bi-window-function-3d98a5b0e07f