Subtract values from two rows in matrix

[maart666]

Hello,

Every week I get sales forecasts for which I have to compare the values. Sample model here:

PBI file 

I am looking for a way to show the changes between individual forecasts in quantitative and percentage terms, like in this Excel:

File 

Thank you in advance for any tips.

Marcin

[maart666]

Thank you Kelly,

works perfect!

I salut you!

Marcin

[maart666]

Hi Kelly,

it looks great accept one case, when in lastforecast there was no value (filed was empty), and in thisforecast is value, mesure do not count that diefference... Is it a way to clear that issue?

Thank you.

Marcin

[maart666]

Thank you Pat!

It works perfectly when I compare data from subsequent forecasts. But if the forecasts are not consecutive e.g. 1 and 3 (I know I should mentioned this) the values are incorrect:

Could you help solve this problem?

Thank you.

Marcin

[v-kelly-msft · Accepted solution]

Hi  @maart666 ,

Modify your measure as below:

Difference = 
VAR thisforecastnum =
    MIN ( Arkusz1[Forecast no] )
VAR thisforecast =
    SUM ( Arkusz1[Qty] )
var lastforecastnum=CALCULATE(MAX('Arkusz1'[Forecast no]),FILTER(ALLSELECTED(Arkusz1),'Arkusz1'[Forecast no]<MAX('Arkusz1'[Forecast no])))
VAR lastforecast =
    CALCULATE (
        SUM ( Arkusz1[Qty] ),
        Arkusz1[Forecast no] = lastforecastnum
    )
RETURN
    IF (
        ISBLANK ( lastforecast ),
        BLANK (),
        thisforecast - lastforecast
    )

And you will see:

 

For the related .pbix file,pls see attached.

Best Regards,
Kelly

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[mahoneypat]

This measure expression will give you the difference from the current forecast to the previous one.

Difference =
VAR thisforecastnum =
    MIN ( Arkusz1[Forecast no] )
VAR thisforecast =
    SUM ( Arkusz1[Qty] )
VAR lastforecast =
    CALCULATE (
        SUM ( Arkusz1[Qty] ),
        Arkusz1[Forecast no] = thisforecastnum - 1
    )
RETURN
    IF (
        ISBLANK ( lastforecast ),
        BLANK (),
        thisforecast - lastforecast
    )

To get your % difference, just change the Return part using the same variable (e.g., DIVIDE(thisforecast - lastforecast, lastforecast)

Regards,

Pat