Forum Discussion
Trailing 12 Week Average
Hi everyone,
I have just started using Power BI and DAX however I have been struggling with a trailing average measure. My data is sorted like the example data below.
The problem I am having is that all functions seem to aim at dates instead of week numbers.
What formula could create a trailing average for 12 weeks excluding the current week?
Currently I am using something like this
Measure =
VAR __CurrentWeek = WEEKNUM(TODAY())
VAR __StartWeek = __CurrentWeek - 13
RETURN
AVERAGEX(FILTER('Table', [Week No] >= __StartWeek && [Week No] < __CurrentWeek),[Salesvalue])
However, this takes an average of the individual vales for sales value. I need the averages for the sum of the entire week.
Hope someone can help me.
Kind regards,
Majesteit
| Week No | Salesvalue | Parameter 1 | Parameter 2 |
1 | 345 | Promo | Store |
| 1 | 34 | Regular | Online |
| 2 | 21 | Promo | Store |
| 2 | 1245 | Regular | Online |
| 3 | 5636 | Promo | Store |
| 3 | 37 | Regular | Online |
| 4 | 35 | Promo | Store |
Anonymous , I would Advice to use week Rank, inplace of week num,
Try a meausre like
Avg Last 13 weeks = CALCULATE(Averagex(Values('Date'[Week Rank]), [Sales Value]) , FILTER(ALL('Date'),'Date'[Week Rank]>=max('Date'[Week Rank])-13 && 'Date'[Week Rank]<=max('Date'[Week Rank])))
Where Week Rank is column
Week Rank = RANKX(all('Date'),'Date'[Week Start date],,ASC,Dense)
OR
Week Rank = RANKX(all('Date'),'Date'[Year Week],,ASC,Dense) //YYYYWW format
1 Reply
Anonymous , I would Advice to use week Rank, inplace of week num,
Try a meausre like
Avg Last 13 weeks = CALCULATE(Averagex(Values('Date'[Week Rank]), [Sales Value]) , FILTER(ALL('Date'),'Date'[Week Rank]>=max('Date'[Week Rank])-13 && 'Date'[Week Rank]<=max('Date'[Week Rank])))
Where Week Rank is column
Week Rank = RANKX(all('Date'),'Date'[Week Start date],,ASC,Dense)
OR
Week Rank = RANKX(all('Date'),'Date'[Year Week],,ASC,Dense) //YYYYWW format