Dynamic measure to calculate impacts of a column

[trevordunham]

I want to create a measure that shows the impacts of a category column (the change in the overall score measure when the specific category is removed)

I want to create a table like this:

Category	Score	Impact	Count
a	30	-10	30
b	40	-8	45
c	45	3	51
d	50	4	10
Total	40	0	136

The impact column in this example is not correct just for example.

I tried to create this with the following fields:

Total Score = AVERAGE('Table'[Score])

Impact of Category = CALCULATE(AVERAGE('Table'[Score]),ALL(Table[Category])<>"Selected Category")

Impact Score = [Total Score] - [Impact of Category]

I know ALL(Table[Category])<>"Selected Category" is the issue with my code. What is the correct DAX to instead of <> "Selected Category", instead return where it is not equal to each category in the table dynamically? 

[v-yangliu-msft · Accepted solution]

Hi  @trevordunham ,

Thanks for the reply from @Greg_Deckler , please allow me to provide another insight:  

The argument to the ALL function must be either a reference to a base table or a reference to a base column. You cannot use table expressions or column expressions with the ALL function.

Refer to:

ALL function (DAX) - DAX | Microsoft Learn

You can using the following measure：

Impact of Category =
var _select=SELECTEDVALUE('Table'[Category])
return
CALCULATE(
    AVERAGE('Table'[Score]),FILTER(ALL('Table'),'Table'[Category]<>_select))

Best Regards,

Liu Yang

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

[Greg_Deckler]

@trevordunham 

Perhaps:

Impact of Category = 
  VAR __Category = MAX('Table'[Category]
  VAR __Table = FILTER( ALL( 'Table' ), [Category] <> __Category )
  VAR __Result = AVERAGEX( __Table, [Score] )
RETURN
  __Result

[trevordunham]

@Greg_Deckler 

That seems off for some reason. My numbers are not adding up correctly.

[Greg_Deckler]

@trevordunham Well, I would think that you would want the overall average which would be:

Total Score = AVERAGEX(ALL('Table'), [Score])

You may also be running into a measure totals issue. 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