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## Last 8 Weeks Relative to Slicer End Date

Hi,

I'm sure someone has asked this before but I've trawled through a heap of posts and can't quite find one that works for me.

I have a date slicer with start and end dates, and I have the below measure which gives me the average sales quantity over the last 8 weeks.

Qty Avg 8Wks =
VAR previousWeekDate =
TODAY () - WEEKDAY ( TODAY (), 1 )
RETURN
CALCULATE (
SUM ( ItemSales[Qty] ),
FILTER (
ItemSales,
ItemSales[WkStartDate] <= previousWeekDate
&& ItemSales[WkStartDate] >= ( previousWeekDate - 56 )
)
) / 8

The measure gives me the last 8 weeks average quantity from today, but I want it to give me the last 8 weeks from the end date of the slicer selection.

Thanks,

Michael

1 ACCEPTED SOLUTION
Community Support

According to your description, as in your formula below, you specify the end date is the closest Saturday before today, not the end date of the slicer selection.

``````VAR previousWeekDate =
TODAY () - WEEKDAY ( TODAY (), 1 )``````

Modify you formula like this:

``````Qty Avg 8Wks =
VAR SelectedDay =
MAXX ( ALLSELECTED ( 'Date' ), 'Date'[Date] )
VAR previousWeekDate =
SelectedDay - WEEKDAY ( SelectedDay, 1 )
RETURN
CALCULATE (
SUM ( ItemSales[Qty] ),
FILTER (
ItemSales,
ItemSales[WkStartDate] <= previousWeekDate
&& ItemSales[WkStartDate] >= ( previousWeekDate - 56 )
)
) / 8
``````

Get the correct result in my sample.

I attach my sample below for reference.

Best Regards,
Community Support Team _ kalyj

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

3 REPLIES 3
Community Support

According to your description, as in your formula below, you specify the end date is the closest Saturday before today, not the end date of the slicer selection.

``````VAR previousWeekDate =
TODAY () - WEEKDAY ( TODAY (), 1 )``````

Modify you formula like this:

``````Qty Avg 8Wks =
VAR SelectedDay =
MAXX ( ALLSELECTED ( 'Date' ), 'Date'[Date] )
VAR previousWeekDate =
SelectedDay - WEEKDAY ( SelectedDay, 1 )
RETURN
CALCULATE (
SUM ( ItemSales[Qty] ),
FILTER (
ItemSales,
ItemSales[WkStartDate] <= previousWeekDate
&& ItemSales[WkStartDate] >= ( previousWeekDate - 56 )
)
) / 8
``````

Get the correct result in my sample.

I attach my sample below for reference.

Best Regards,
Community Support Team _ kalyj

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

Super User

Hi,

Create a Calendar Table with a relationship (Many to One and Single) from the WkStartDate column of the ItemSales table to the Date column of the Calendar Table.  Write this measure:

``= CALCULATE(SUM(ItemSales[Qty]),DATESBETWEEN('Calendar'[Date],max('Calendar'[Date])-56,max('Calendar'[Date])))/8``

Hope this helps.

Regards,
Ashish Mathur
http://www.ashishmathur.com
Super User

Please define what you mean by "week" .  Ideally you have a calendar table with week numbers. How do you handle transitions between (fiscal) years ?  Say, "today" is February 1.  What's your definition of "past 8 weeks" in that scenario?