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## Rolling Average extended past end of data

I have used the quick measure to calculate a 12 month rolling average for my data. This all works fine. However, PowerBI appears to have forecast the rolling average past my last data point. So the last data point I have in the time series is February 2019, but the rolling average has been calculated until December 2019.

Can anyone tell me how PowerBI is calculating these extra values? and why it is calculating them? and how to stop it?

I've tried working it out from the DAX and got nowhere!

1 ACCEPTED SOLUTION

Accepted Solutions
Community Support Team

## Re: Rolling Average extended past end of data

Hi @k-m-l

Create measures as below

```total = SUM(Sheet5[value])

calendar date = MAX('calendar'[Date])

true/flase =
VAR lastpoint =
CALCULATE ( MAX ( Sheet5[date] ), ALL ( Sheet5 ) )
RETURN
YEAR ( [calendar date] )
< YEAR ( lastpoint )
|| (
YEAR ( [calendar date] ) = YEAR ( lastpoint )
&& MONTH ( [calendar date] ) <= MONTH ( lastpoint )
)

rolling sum 12 = IF([true/flase]=TRUE(),
VAR __LAST_DATE = ENDOFMONTH('calendar'[Date].[Date])
VAR __DATE_PERIOD =
DATESBETWEEN(
'calendar'[Date].[Date],
)
RETURN
SUMX(
CALCULATETABLE(
SUMMARIZE(
VALUES('calendar'),
'calendar'[Date].[Year],
'calendar'[Date].[QuarterNo],
'calendar'[Date].[Quarter],
'calendar'[Date].[MonthNo],
'calendar'[Date].[Month]
),
__DATE_PERIOD
),
CALCULATE([total], ALL('calendar'[Date].[Day]))
))

rolling average 12 = [rolling sum 12]/12

```

Best Regards
Maggie

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

4 REPLIES 4
Established Member

## Re: Rolling Average extended past end of data

can you post the dax formula

Frequent Visitor

## Re: Rolling Average extended past end of data

It's just the DAX that is generated using the quick measure. I haven't changed it at all.

ALL _Total rolling average =

IF( ISFILTERED('Date'[Cal_Date]),

ERROR("Time intelligence quick measures can only be grouped or filtered by the Power BI-provided date hierarchy or primary date column."),

VAR __LAST_DATE = ENDOFMONTH('Date'[Cal_Date].[Date])

VAR __DATE_PERIOD = DATESBETWEEN( 'Date'[Cal_Date].[Date], STARTOFMONTH(DATEADD(__LAST_DATE, -11, MONTH)), __LAST_DATE )

RETURN AVERAGEX(

CALCULATETABLE(

SUMMARIZE(

VALUES('Date'), 'Date'[Cal_Date].[Year], 'Date'[Cal_Date].[QuarterNo], 'Date'[Cal_Date].[Quarter], 'Date'[Cal_Date].[MonthNo], 'Date'[Cal_Date].[Month] ), __DATE_PERIOD ),

CALCULATE([ALL _Total], ALL('Date'[Cal_Date].[Day])) ) )

Community Support Team

## Re: Rolling Average extended past end of data

Hi @k-m-l

Create measures as below

```total = SUM(Sheet5[value])

calendar date = MAX('calendar'[Date])

true/flase =
VAR lastpoint =
CALCULATE ( MAX ( Sheet5[date] ), ALL ( Sheet5 ) )
RETURN
YEAR ( [calendar date] )
< YEAR ( lastpoint )
|| (
YEAR ( [calendar date] ) = YEAR ( lastpoint )
&& MONTH ( [calendar date] ) <= MONTH ( lastpoint )
)

rolling sum 12 = IF([true/flase]=TRUE(),
VAR __LAST_DATE = ENDOFMONTH('calendar'[Date].[Date])
VAR __DATE_PERIOD =
DATESBETWEEN(
'calendar'[Date].[Date],
)
RETURN
SUMX(
CALCULATETABLE(
SUMMARIZE(
VALUES('calendar'),
'calendar'[Date].[Year],
'calendar'[Date].[QuarterNo],
'calendar'[Date].[Quarter],
'calendar'[Date].[MonthNo],
'calendar'[Date].[Month]
),
__DATE_PERIOD
),
CALCULATE([total], ALL('calendar'[Date].[Day]))
))

rolling average 12 = [rolling sum 12]/12

```

Best Regards
Maggie

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

Community Support Team

## Re: Rolling Average extended past end of data

Hi @k-m-l

Is this problem sloved?

If it is sloved, could you kindly accept it as a solution to close this case?

If not, please let me know.

Best Regards

Maggie

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