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## comparing selected date to a fix dates

HI All,

Thanks in advance. I would like to do below equatio in power bi. Example dates i.e 03/08/2020 week 11 sunday,

pbi results will compare average value of 02/09/2020 week 7 /sunday , 02/16/2020 week 8 /sunday, & 02/16/2020 week 9 /sunday to 03/08/2020 /week 11/ sunday  and

and on 03/09/2020 / Week 11 / monday will compare average value of "monday" values on week 7,8,9.

so basically, all future days/date will also be compared to average of "same day " on week 7,8,& 9

I was able to do a weekly comparison but not sure if how to add filter on variable dates

%Diff_BL_Volume =
VAR WK9 = CALCULATE([Volume],
Filter(all('Date Table'),
'Date Table'[week]=9
))
VAR WK10 = CALCULATE([Volume],
Filter(all('Date Table'),
'Date Table'[week]=10
))
VAR WK11 = CALCULATE([volume],
Filter(all('Date Table'),
'Date Table'[week]=11
))
VAR BL = CALCULATE((wk9+wk10+wk11)/3)
return
Divide ([volume]-bl,bl,0)

appreciate the help!!! 1 ACCEPTED SOLUTION  Community Support

Hi @nardtmo ,

We can use the following steps to meet your requirement.

1. We can create a measure like this,

``````%Diff_BL_Volume =
VAR WK7 =
CALCULATE (
[Volume],
FILTER (
ALLEXCEPT ( 'Date Table', 'Date Table'[day name] ),
'Date Table'[week] = 7
)
)
VAR WK8 =
CALCULATE (
[Volume],
FILTER (
ALLEXCEPT ( 'Date Table', 'Date Table'[day name] ),
'Date Table'[week] = 8
)
)
VAR WK9 =
CALCULATE (
[Volume],
FILTER (
ALLEXCEPT ( 'Date Table', 'Date Table'[day name] ),
'Date Table'[week] = 9
)
)
VAR BL =
CALCULATE ( ( wk7 + WK8 + WK9 ) / 3 )
RETURN
DIVIDE ( [Volume] - BL, BL, 0 )``````

2. Then we need to add two slicer, one controls week number, another controls week day name.

The result like this,  If it doesn’t meet your requirement, could you please show the exact expected result based on the table that we have shared?

BTW, pbix as attached.

Best regards,

Community Support Team _ zhenbw
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

2 REPLIES 2  Community Support

Hi @nardtmo ,

We can use the following steps to meet your requirement.

1. We can create a measure like this,

``````%Diff_BL_Volume =
VAR WK7 =
CALCULATE (
[Volume],
FILTER (
ALLEXCEPT ( 'Date Table', 'Date Table'[day name] ),
'Date Table'[week] = 7
)
)
VAR WK8 =
CALCULATE (
[Volume],
FILTER (
ALLEXCEPT ( 'Date Table', 'Date Table'[day name] ),
'Date Table'[week] = 8
)
)
VAR WK9 =
CALCULATE (
[Volume],
FILTER (
ALLEXCEPT ( 'Date Table', 'Date Table'[day name] ),
'Date Table'[week] = 9
)
)
VAR BL =
CALCULATE ( ( wk7 + WK8 + WK9 ) / 3 )
RETURN
DIVIDE ( [Volume] - BL, BL, 0 )``````

2. Then we need to add two slicer, one controls week number, another controls week day name.

The result like this,  If it doesn’t meet your requirement, could you please show the exact expected result based on the table that we have shared?

BTW, pbix as attached.

Best regards,

Community Support Team _ zhenbw
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.  Super User

@nardtmo ,Not sure I got it completely

Typically same weekday is 7 days behind and same week last year is 364 days behind

So you can use a 7-day trailing measure

Example

``````sales =SUM(Sales[Sales Amount])
diff = [sales] -[Day behind Sales]``````

To deal with Week you can refer my file

https://www.dropbox.com/s/d9898a48e76wmvl/sales_analytics_weekWise.pbix?dl=0  