Calculation of moving average on basis of weekday

[Anonymous]

I have sales data for a year for different stores and dfifferent products. I wish to calculate average sales on basis of weekday i.e if today is Wednesday, today's average would be the average sales of last 4 wednesdays.

 I could do that by creating 4 different tables with dates and sales number but it makes the work so troublesome and slow. 

[amitchandak]

Try something like this with Date Calendar

Rolling 4 week same week day = CALCULATE(sum(Sales[Sales Amount]),DATESINPERIOD('Date'[Date],MAX(Sales[Sales Date]),-28,Day),filter(Date, WeekDay('Date'[Date])=max( WeekDay('Date'[Date]))))  

To get the best of the time intelligence function. Make sure you have a date calendar and it has been marked as the date in model view. Also, join it with the date column of your fact/s. Refer :
https://radacad.com/creating-calendar-table-in-power-bi-using-dax-functions
https://www.archerpoint.com/blog/Posts/creating-date-table-power-bi
https://www.sqlbi.com/articles/creating-a-simple-date-table-in-dax/

[Greg_Deckler]

Please see this post regarding How to Get Your Question Answered Quickly: https://community.powerbi.com/t5/Community-Blog/How-to-Get-Your-Question-Answered-Quickly/ba-p/38490

Sample data would be great. If you have a weeknum column (WEEKNUM) this should be relatively straight-forward. https://community.powerbi.com/t5/Quick-Measures-Gallery/Rolling-Weeks/m-p/391694#M128