New user needs help with DAX

[KrilleGTI]

Hi 

I need some help on how to programme a new meassure or table/column.

I have a table with the columns named CompanyID, Values and Date.  I would like to calculate the difference in percentage between the average of values for the oldest date for each row. I have no problem creating it in Excel but I want to use it in Power bi together with a slider for CompanyIDs and Dates. Expecting the result is the orange coloured table.

/Christian

[Anonymous · Accepted solution]

Hi, @KrilleGTI 

Based on your information, I create a table

Then I create a new measure named Average value by date

Based on your requirements, I've created a measure, and here's a preview of me

Here is my DAX

Measure = var a=MAXX(FILTER(ALLSELECTED('Table'),[Date]<MAX('Table'[Date])),[Date])

var b=CALCULATE([Average value by date],'Table'[Date]=MINX(ALLSELECTED('Table'),[Date]))

RETURN DIVIDE([Average value by date],b)-1

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Yongkang Hua

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[KrilleGTI]

Works perfect, Thanks!

[KrilleGTI]

How can I attach my Power BI file? I have it almost working just need some help with pecentage calculation.