DAX: Help with dynamic calculated column

[astojanac]

Hi all, 

I'm dealing with the problem of using the calculated value from the previous row in the current row.

My example and Excel output file are at the link below:

https://drive.google.com/drive/folders/1QPtIREy36SoVdkdxPimng3-nIpqRHb6Q?usp=sharing

I made 2 columns (Closing and Closing 2) but there's a little difference from what I acctualy need. 

Regards

I appriciate any help or hint!

[Greg_Deckler]

@astojanac See my article on Mean Time Between Failure (MTBF) which uses EARLIER: http://community.powerbi.com/t5/Community-Blog/Mean-Time-Between-Failure-MTBF-and-Power-BI/ba-p/3395....
The basic pattern is:
Column = 
  VAR __Current = [Value]
  VAR __PreviousDate = MAXX(FILTER('Table','Table'[Date] < EARLIER('Table'[Date])),[Date])

  VAR __Previous = MAXX(FILTER('Table',[Date]=__PreviousDate),[Value])
RETURN
  __Current - __Previous

[astojanac]

Hi @Greg_Deckler ,

Thanks a lot for the answer, but unfortunately I can't find way out with this kind of formula.

My formula returns nicely, however the problem is that it does not calculate interest on every amount but collects all payments and then calculates interest. Is there a chance you can help me overcome this problem?

Thanks in advance!

[Anonymous · Accepted solution]

Hi @astojanac,

It sounds like multiple aggregate requirements, you can try to add a variable with summarize function to apply the first aggregation then use the iterator function with that variable to enable another aggregation.

All the secrets of SUMMARIZE - SQLBI

Measure Totals, The Final Word 

Regards,
Xiaoxin Sheng