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

[v-yohua-msft · 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

How to Get Your Question Answered Quickly 

If it does not help, please provide more details with your desired output and pbix file without privacy information (or some sample data)

Best Regards

Yongkang Hua

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[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.