Help with Variance calculation with current month vs selected month from slicer

[Diva20]

Hello All

Im trying to achieve a DAX expression to find the variance for the following below table:

the formaula used in excel is 

Dec = $B$2-B2

Nov = $B$2-B3

Oct = $B$2-B4

Sep = $B$2-B5

Aug = $B$2-B6

Im currently using the follwoing measure and it doesnt work:

Variance P + Companies =
var prevmonth =
CALCULATE ( [Oppurtunities], DATEADD ( 'MasterData'[Date], -1, MONTH ) )
RETURN
IF (
ISBLANK (prevmonth),
0,
[Oppurtunities] - prevmonth
)

Can anyone help me out on the DAX expression with Variance calculation for current month vs selected month from slicer.

TIA 🙂

[v-janeyg-msft · Accepted solution]

Hi, @Diva20 

It’s my pleasure to answer for you.

According to your description,You should have a date column or a date table, and your oppurtunities column seems to be a measure, so ,you can add a separate month column as a slicer through ‘enter data’,then create a measure to calculate the desired result.

Like this:

Variance P + Companies =
VAR a =
    SELECTEDVALUE ( 'Table (2)'[Month] )
VAR b =
    CALCULATE (
        [Measure],
        FILTER ( ALL ( 'Table' ), 'Table'[Month] = SELECTEDVALUE ( 'Table'[Month] ) )
    )
VAR c =
    CALCULATE (
        [Measure],
        FILTER (
            ALL ( 'Table' ),
            'Table'[Month] = SELECTEDVALUE ( 'Table (2)'[Month] )
        )
    )
RETURN
    IF ( ISBLANK ( [Measure] ), 0, c - b )

Here is my sample .pbix file.Hope it helps.

If it doesn’t solve your problem, please feel free to ask me.

Best Regards

Janey Guo

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

[Ashish_Mathur]

Hi,

What do you mean by "for current month vs selected month from slicer"?  In the example that you have shown, what is the current month and what month have you chosen in the slicer?  Also, your base data should also have a Year column - I do not see that.

[AlB]

Hi @Diva20 

You need to use DATEADD( ) on a well-constructed date table, not on your fact table. Are you doing that?

Please mark the question solved when done and consider giving a thumbs up if posts are helpful.

Contact me privately for support with any larger-scale BI needs, tutoring, etc.

Cheers