COUNT vs DISTINCTCOUNT for coverage calculations

[megane123]

Hi all,

I am struggling to work out what I think should be some fairly straightforward DAX and can't find anything in the forum. Apologies if I have missed another post.

I have a client and product columns. What I am trying to achieve is to calculate what 'client coverage' each product has. Client coverage is defined by the percentage of clients that have a product and is between 0% and 100%. What is throwing a spanner in doing a COUNT(Products)/COUNT DISTINCT(Clients) is that some clients have some products more than once; the way I want my calculation to work is to be binary: A client has it or doesn't. I am not interested in how many times they have bought it.

Example data:

Client	Product
A	1
A	2
A	3
B	1
B	1
B	2
C	1

In this instance, all clients have product 1, but Client B has it twice. Therefore coverage should be 100% not 133% if I did the formula above.

Expected calculated output:

Product	Client Coverage
1	100%
2	67%
3	33%

Any help on this would be greatly appreciated. Thanks!

[dedelman_clng]

Hi @megane123 - try something like this

Client Coverage =
VAR __Prod =
    COUNTX ( VALUES ( Coverage[Client] ), DISTINCTCOUNT ( Coverage[Product] ) )
VAR __Client =
    COUNTROWS ( ALL ( Coverage[Client] ) )
RETURN
    DIVIDE ( __Prod, __Client, 0 )

  

Hope this helps

David