Index 100 based on sliced year and Item

[Justinnn]

Hi all,

I'm new to PowerBI, so help would be greatly appreciated. Especially since the function 'Index' has come out, the problem should be easier for the experts to solve.

Data

I have the following Table called 'Spend':

Date	Item	Price
01/03/2022	Gas	60
01/04/2022	Gas	63
01/05/2022	Gas	64
01/03/2022	Timber	20
01/04/2022	Timber	22
01/05/2022	Timber	26
01/03/2022	Plastic	4
01/04/2022	Plastic	5
01/05/2022	Plastic	6

I want to have a dynamic index model based on the slicers for "date". The index should be 100 (Price / Base Price) with a flexible baseline. For Gas, the index numbers would be 100, 105 and 106,7. However, if the date is changed to April 2022, the index values should become 0, 100, 101.6. Furthermore, it should start again for each unique Item (i.e., Plastic & Timber).

Thank you for helping out!

Additional Screenshot:

[Justinnn]

Hi @tamerj1 ,

Thank you so much for helping me! That was 99% of the code. However, I wanted that the index itself also became flexible. This was my final code for others for future reference.

Price Index = 
VAR SelectedDate = MINX(ALLSELECTED('Table'[Date]), 'Table'[Date])
VAR BaseTable = 
    CALCULATETABLE ( 
        TOPN ( 1, 'Table', 'Table'[Date], ASC ),
        ALLEXCEPT ( 'Table', 'Table'[Item] ), 
        'Table'[Date] = SelectedDate 
    )
VAR BasePrice = 
    MAXX ( BaseTable, 'Table'[Price] )
VAR CurrentPrice = 
    SELECTEDVALUE ( 'Table'[Price] )
VAR REsult =
    DIVIDE ( CurrentPrice, BasePrice ) * 100
RETURN 
    IF (
        NOT ISEMPTY ( CALCULATETABLE ( 'Table', ALL ( 'Table'[Date] ) ) ),
        DIVIDE ( CurrentPrice, BasePrice ) * 100 + 0
    ) 

[tamerj1 · Accepted solution]

Hi @Justinnn 
Please refer to attached sample file with the solution

Price Index = 
VAR BaseTable = 
    CALCULATETABLE ( 
        TOPN ( 1, 'Table', 'Table'[Date], ASC ),
        ALLEXCEPT ( 'Table', 'Table'[Item] ), 
        ALLSELECTED ( 'Table'[Date] ) 
    )
VAR BasePrice = 
    MAXX ( BaseTable, 'Table'[Price] )
VAR CurrentPrice = 
    SELECTEDVALUE ( 'Table'[Price] )
VAR REsult =
    DIVIDE ( CurrentPrice, BasePrice ) * 100
RETURN 
    IF (
        NOT ISEMPTY ( CALCULATETABLE ( 'Table', ALL ( 'Table'[Date] ) ) ),
        DIVIDE ( CurrentPrice, BasePrice ) * 100 + 0
    )