Subtracting row from previous row to get current row

[Anonymous]

I need a DAX to calculate the following.... 

The DAX for Change

 = Orginal QTD (using total by quarter measure) - Current QTD(using total by quarter measure) 

I have a Values column which is the Monthly goal total.  I need to work my way backwards from the example of 2603 and minus the quarterly change EX: 0 to get the row above it(2603).  For the next row, minus $25 from $2603 etc...  The tricky part is the 2603 is the total of a different column. 

So if I have 
Quarter     Change      Calculation 

1 2021        0               2603
2 2021        0               2603

3 2021       25              2603
4 2021       63              2578 
1 2022      33               2515
2 2022      56               2482 
3 2022      0                 2426

Blank**** 137 

*****(I have data with no dates) 
I hope that makes sense! 

[speedramps · Accepted solution]

Try  this ...

Use Power query to derive a date from the quarter. Either the first date or the last dfate of th quater will suffice.

Then relate date to a standard Calendar table which has a quater offset column

Then create measure using offsets ....

This quarter value = CALCULATE( SUM(table[value], DimCalandar[quarteroffset= 0)

Previous quarter value = CALCULATE( SUM(table[value], DimCalandar[quarteroffset= -1)

Difference = [This quarter value] - [Previous quarter value] =

Do all these free training modules to learn about Calandars and offsets

https://www.youtube.com/playlist?list=PL7GQQXV5Z8eczWqKFMDVoHMjTcpH3tgZm

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