Calculate average of percentage price changes instead of change of the average price

[00Kevin00]

Hey community,

I have the following problem:

For a list of products (here ISBN) I have two measures which give me the MIN and MAX Prices for a selected time period.
Based on these measures, I calculate the the Period-over-Period percentage change via the following DAX Measure

PoP %-∆ = 
VAR Part1 = DIVIDE([Price for MAX_Date],[Price for MIN_Date])

RETURN
IF(Part1=BLANK(),BLANK(),Part1-1)

However, for the total, I don't need the change of the average price, but the average of the percentage price changes.

Could someone help me with that? 

[v-jingzhan-msft]

Hi @00Kevin00 

You may try creating a new measure like this

new measure =
DIVIDE (
    SUMX ( VALUES ( 'Table'[ISBN] ), [PoP %-∆] ),
    COUNTROWS ( VALUES ( 'Table'[ISBN] ) )
)

Best Regards,
Jing
If this post helps, please Accept it as Solution to help other members find it. Appreciate your Kudos!

[00Kevin00]

Hey Jing, thanks for your reply.

I'm almost there - as you can see in my screenshot, [PoP %-∆] contains Blank rows, which should not be counted into the average calculation (but 0%, do). Could you adjust the formula so that it counts only the ISBNs where [PoP %-∆] is not blank?

Thank you so much!

[00Kevin00 · Accepted solution]

Found the solution 🙂

new measure =
DIVIDE(
    SUMX(
        FILTER(
            VALUES('Table'[ISBN]),
            NOT(ISBLANK([PoP %-∆]))
        ),
        [PoP %-∆]
    ),
    COUNTROWS(
        FILTER(
            VALUES('Table'[ISBN]),
            NOT(ISBLANK([PoP %-∆]))
        )
    )
)

[Greg_Deckler]

@00Kevin00 First, please vote for this idea: https://ideas.powerbi.com/ideas/idea/?ideaid=082203f1-594f-4ba7-ac87-bb91096c742e

This looks like a measure totals problem. Very common. See my post about it here: https://community.powerbi.com/t5/DAX-Commands-and-Tips/Dealing-with-Measure-Totals/td-p/63376

Also, this Quick Measure, Measure Totals, The Final Word should get you what you need:
https://community.powerbi.com/t5/Quick-Measures-Gallery/Measure-Totals-The-Final-Word/m-p/547907

Also: https://youtu.be/uXRriTN0cfY
And: https://youtu.be/n4TYhF2ARe8