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## MAX difference between current row and previous row as a measure

Hi
I am trying to learn how to DAX and I have been trying to figure this out for the last couple of days, but getting nowhere.

I am trying to subtract the value of the previous row from the of current row (which I appear to have managed) and then get the overall MAX. In the example below returning 15.

My questions are:
1) Is the LOOKUPVALUE the best way to get the prevVal or are there better ways of doing this?
2) How do I then get the MAX?

I tried MAXX around the RETURN formula but wasn't getting anywhere...

Any guidance is appreciated.

Thanks

Oli

1 ACCEPTED SOLUTION
Super User

Hi,

I tried to create a sample pbix file like below.

Please check the below picture and the attached pbix file.

``````Expected result measure: =
MAXX (
FILTER (
Data,
"@prevvalue",
CALCULATE (
SUM ( Data[Value] ),
FILTER ( Data, Data[Index ID] = EARLIER ( Data[Index ID] ) - 1 )
)
),
[@prevvalue] <> BLANK ()
),
"@diff", Data[Value] - [@prevvalue]
),
[@diff]
)``````

If this post helps, then please consider accepting it as the solution to help other members find it faster, and give a big thumbs up.

Super User

Hi,

I tried to create a sample pbix file like below.

Please check the below picture and the attached pbix file.

``````Expected result measure: =
MAXX (
FILTER (
Data,
"@prevvalue",
CALCULATE (
SUM ( Data[Value] ),
FILTER ( Data, Data[Index ID] = EARLIER ( Data[Index ID] ) - 1 )
)
),
[@prevvalue] <> BLANK ()
),
"@diff", Data[Value] - [@prevvalue]
),
[@diff]
)``````

If this post helps, then please consider accepting it as the solution to help other members find it faster, and give a big thumbs up.

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