Aggregate (Mean) of a resulting visual in Power BI - powerbi

Question

I am having a problem since I want an aggregated version of a filtered resulting visual.
Process:
Using a Text Filter:
a. Input Merchant ID and Year-Month.
Resulting Visual 1 will look like this if you input Merchant ID (1234) and Year-Month (2020-01):
Merchant ID CardNum Year-Month Amount
1234 1abc1 2020-01 1.00
1234 2def2 2020-01 100.00
1234 3ghi3 2020-01 65.00
Visual 2 then displays the Merchant History for each CardNumber listed in Visual 1.
Resulting Visual 2 will look like this:
Card Number Merchant ID Date Amount
1abc1 abc 2020-01 1.00
1abc1 def 2020-01 2.00
1abc1 xyz 2020-01 3.00
2def2 abc 2020-01 100.00
2def2 xyz 2020-01 200.00
3ghi3 abc 2020-01 300.00
Now I want something that will give me this output ordered from highest to lowest:
Merchant ID xRatio
abc 1
xyz 2/3
def 1/3
xRatio is the mean of Merchant ID occurrences aggregated over the card numbers
Detailed Explanation:
Merchant ID abc occurred for all 3 card numbers thus ((1+1+1)/3) is the result
Merchant ID xyz occurred for 2 card numbers thus ((1+1)/3) is the result
Merchant ID def occurred for 1 card number only thus (1/3) is the result
where "n" is the count of unique card numbers as seen in Visual 1

Answer 1

Create this following 3 measure and 1 custom column in given order in your table-
1.
distinct_card_number =
CALCULATE(
DISTINCTCOUNT(your_table_name[Card Number]),
ALL(your_table_name)
)
2. Create a custom column as below
card-merchant = your_table_name[Card Number] & "-" & your_table_name[Merchant ID]
3.
distinct_merchant_count = DISTINCTCOUNT(your_table_name[card-merchant])
4. now create the final measure as below-
xRatio =
IF(
[distinct_card_number] = [distinct_merchant_count],
"1",
[distinct_merchant_count] &"/"& [distinct_card_number]
)
Now add merchant_id and xRatio to your table visual. The output will be like below-