topic Re: Use previous row in current column calculation in DAX Commands and Tips

Use previous row in current column calculation

mellon199 — Wed, 27 Jul 2022 13:08:40 GMT

Hello, trying to create a calculated column using data from the previous row.

See example below for situation which has been calculated in excel for Indexation Factor.

Indexation factor formula = B2*(1+A3)

Within excel row B1 is manually set to 1 and the fields below are using the calculation above.

Can this be replicated using a calculated column within PowerBI? Thanks in advance.

(A) Selected Index	(B) Indexation Factor
	1
0.029683	1.029683334
0.004578	1.03439749
0.049629	1.08573384
0.047982	1.137829244
0.030898	1.172985656
0.028848	1.206823699
0.019598	1.230475107
0.010779	1.24373867
0.021425	1.270385647
0.037423	1.31792673
0.030566	1.358210528
0.025874	1.393353256
0.012128	1.410252314
0.057762	1.491711364
0.123262	1.675582498
0.043063	1.747738101

Re: Use previous row in current column calculation

Greg_Deckler — Wed, 27 Jul 2022 13:17:10 GMT

mellon199 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/339586.
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

Re: Use previous row in current column calculation

tamerj1 — Wed, 27 Jul 2022 14:03:38 GMT

Hi mellon199
Here is a sample file with the solution https://we.tl/t-KyxjUgcvAi

For a caclulated column:

Indexation Factor = VAR T1 = FILTER ( Data, Data[Index] <= EARLIER ( Data[Index] ) ) RETURN PRODUCTX ( T1, 1 + Data[Selected Index] )

For a measure:

Indexation Factor Measure = VAR SelectedIndex = SELECTEDVALUE ( Data[Index] ) VAR T1 = CALCULATETABLE ( Data, Data[Index] <= SelectedIndex, ALL ( Data[Selected Index] ) ) RETURN PRODUCTX ( T1, 1 + Data[Selected Index] )

Re: Use previous row in current column calculation

mellon199 — Wed, 27 Jul 2022 16:55:41 GMT

Amazing tamerj1 - Thank you for taking the time to complete a working example! 😊