How to find the variance between two parameters?

[financelead]

Spoiler

Edited.

Hi, Sorry if this has been asked before.. Please can some one help?

I have the below data in Power BI.. 

I want it to show the variance between any two periods when selected using two slicers for Period in Power BI.. thanks

Period	Forecast
P03	7000
P03	8000
P02	15000
P02	56000
RF12	1000
RF12	25000

[financelead]

This is great, thank you so much.. you are a star!!

[danextian · Accepted solution]

Hi @financelead ,

For this use case, I'd create two extra tables that hold the periods - these tables are disconnected(no relationship with) from the fact table - and then a measure for the variance.

Period1 = 
DISTINCT ( Data[Period] )

Period2 = 
DISTINCT ( Data[Period] )

Variance = 
CALCULATE (
    SUM ( Data[Forecast] ),
    Data[Period] = SELECTEDVALUE ( Period1[Period] )
)
    - CALCULATE (
        SUM ( Data[Forecast] ),
        Data[Period] = SELECTEDVALUE ( Period2[Period] )
    )

sampel output -

sample pbix - https://drive.google.com/file/d/1HaM63-KmwyXdkhGt89hhvKkMMuPHrGv0/view?usp=sharing