Count distinct number of combinations within groups

[dmitry-wbr]

Hi all!

I have the following table as a data source in Power BI:

What I want to do is to see how many unique combinations of categories are there within all groups and sum them up by category. For example, category 3 has 4 total combinations across all groups (0 in group 1 + 2 in group 2 (with categories 1 and 2) + 2 in group 3 (with categories 1 and 2) = 4 combinations in total).
In the end, I want a table that looks like this:

Have been testing various DAX functions in order to achieve that result, but no luck.
Would greatly appreciate your help!

[Jihwan_Kim · Accepted solution]

Hi, @dmitry-wbr 

Please try the below measure.

Count measure =
VAR currentcategory =
MAX ( 'Table'[Category] )
VAR includingcurrentcategory =
VALUES ( 'Table'[Group] )
VAR newtable =
SUMMARIZE (
FILTER (
ALL ( 'Table' ),
'Table'[Group]
IN includingcurrentcategory
&& 'Table'[Category] <> currentcategory
),
'Table'[Group],
'Table'[Category]
)
RETURN
SUMX ( newtable, 1 )

Hi, My name is Jihwan Kim.

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[amitchandak]

@dmitry-wbr , Try a measure like

sumx(values(Table[category]), calculate(distinctCOUNT(Table[group])))

[dmitry-wbr]

Hi, @amitchandak 
Thanks for the reply! Unfortunately, your formula gives incorrect results. Here is the resulting output (should be 5 for categories 1,2 and 4 for category 3):