Calculate % based on a combination of count and stored values - Power BI

Question

I have a basic table that looks like this:

 DayNo. Customer    AgentsInvolved  CallID
   0      AAA              1        1858
   0      AAA              3        1859
   2      AAA              1        1860
   0      BBB              2        1862
   0      CCC              1        1863
   0      DDD              3        1864
   9      DDD              1        1865
   9      DDD              4        1866

I need to be able to find the % of customers who only contacted only once, and spoke to 1 agent only. So from the above example, out of 4 distinct customers only customer CCC falls into this category (1 call, 1 AgentInvolved)

So the Desired result would be: 1/4 or 25%

How can I create a Power BI measure to do this calc?

Answer 1

Try this measure:

Desired Result =
VAR summarizetable =
    SUMMARIZECOLUMNS (
        'table'[Customer],
        "Calls", COUNT ( 'table'[CallID] ),
        "Agents", SUM ( 'table'[AgentsInvolved] ),
        "Day", SUM ( 'table'[DayNo.] )
    )
RETURN
    COUNTROWS (
        FILTER ( summarizetable, [Calls] = 1 && [Agents] = 1 && [Day] = 0 )
    )
        / COUNTROWS ( summarizetable )

The summarized table created on the fly in VAR summarizetable looks like this: