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Post Prodigy

## Difference between most recent value and last value

Hi,
I'm currently calculating the difference in Facebook likes between the last update and the most recent update.
Our updates vary, sometimes after 7 days, sometimes after 10 days, sometimes after 14 days.

How can I automate this case so that it works every time?
The breakdown by country is not important.

1 ACCEPTED SOLUTION
Super User

@pawelj795 - Sorry, I always mess up dates in non-US form.

``````Measure =
VAR __MaxDate = MAX('Table'[Update Date])
VAR __2ndDate = MAXX(FILTER('Table',[Update Date]<>__MaxDate),[Update Date])
VAR __2ndValue = SUMX(FILTER('Table',[Update Date] = __2ndDate),[Likes])
VAR __MaxValue = SUMX(FILTER('Table',[Update Date] = __MaxDate),[Likes])
RETURN
__MaxValue - __2ndValue``````

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The Definitive Guide to Power Query (M)

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8 REPLIES 8
Super User

@pawelj795 - Not sure I 100% follow but I think:

``````Measure =
(MAX([Update Date]) - MIN([Update Date]) * 1.``````

Kind of interested how you get fractional Likes.

Become an expert!: Enterprise DNA
External Tools: MSHGQM
Latest book!:
The Definitive Guide to Power Query (M)

DAX is easy, CALCULATE makes DAX hard...
Post Prodigy

@Greg_Deckler
Thanks for weighing in.

Fractional likes come from rounding percentages 😉 They are not important.

I show below example of my desired results.
I want to calculate difference between value in blue circle and value in red circle.

Super User

@pawelj795 - Ah, you need Lookup Min/Max - https://community.powerbi.com/t5/Quick-Measures-Gallery/Lookup-Min-Max/m-p/985814#M434

Basically,

``````Measure =
VAR __MinDate = MIN('Table'[Update Date])
VAR __MaxDate = MAX('Table'[Update Date])
VAR __MinValue = SUMX(FILTER('Table',[Update Date] = __MinDate),[Likes])
VAR __MaxValue = SUMX(FILTER('Table',[Update Date] = __MaxDate),[Likes])
RETURN
__MaxValue - __MinValue``````

Become an expert!: Enterprise DNA
External Tools: MSHGQM
Latest book!:
The Definitive Guide to Power Query (M)

DAX is easy, CALCULATE makes DAX hard...
Post Prodigy
I don't think that MIN is appropriate in this case.

I need the difference between the most recent value and the second recent value as I shown in the previous photo.
Look at my measure, I only need the last part.

Super User

@pawelj795 - Sorry, I always mess up dates in non-US form.

``````Measure =
VAR __MaxDate = MAX('Table'[Update Date])
VAR __2ndDate = MAXX(FILTER('Table',[Update Date]<>__MaxDate),[Update Date])
VAR __2ndValue = SUMX(FILTER('Table',[Update Date] = __2ndDate),[Likes])
VAR __MaxValue = SUMX(FILTER('Table',[Update Date] = __MaxDate),[Likes])
RETURN
__MaxValue - __2ndValue``````

Become an expert!: Enterprise DNA
External Tools: MSHGQM
Latest book!:
The Definitive Guide to Power Query (M)

DAX is easy, CALCULATE makes DAX hard...
Post Prodigy

@Greg_Deckler
Thanks that works perfectly! I was exactly looking for that.

By the way, I have the same issue with US date format 😉

Super User
@pawelj795 - Sweet!

Become an expert!: Enterprise DNA
External Tools: MSHGQM
Latest book!:
The Definitive Guide to Power Query (M)

DAX is easy, CALCULATE makes DAX hard...
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