Measure Repeat Customer by Date

[Index_Match]

Hi all,

I think I have a somewhat easy question, but I'm having a hard time solving. I'm try to find the count of repeat customers by year, comparing this year to the previous year. For example, in the sample data table John would not count as a repeat customer because it was not in consecutive years. Thank you in advance!

Sample Data

Year	Customer
1/1/2018	| John
1/1/2018	| Sam
1/1/2019	| Sam
1/1/2019	| Leon
1/1/2020	| John
1/1/2020	| Sam
1/1/2020	| Leon

Expected Result

Year	Repeat Customer from Previous Year
1/1/2018	| 0
1/1/2019	| 1
1/1/2020	| 2

[parry2k]

@Index_Match my solution is already using a date table, did you look at it at all?

[VahidDM · Accepted solution]

Hi @Index_Match 

Try this measure [without Date Table]:

Repeat Customers =
VAR _A =
    ADDCOLUMNS (
        Customer,
        "CY",
            CALCULATE (
                DISTINCTCOUNT ( Customer[Customer] ),
                FILTER (
                    ALL ( customer ),
                    YEAR ( Customer[Year] )
                        = YEAR ( EARLIER ( Customer[Year] ) ) - 1
                        && Customer[Customer] = EARLIER ( Customer[Customer] )
                )
            ) + 0
    )
RETURN
    SUMX ( _A, [CY] )

output:

If this post helps, please consider accepting it as the solution to help the other members find it more quickly.
Appreciate your Kudos!!
LinkedIn: www.linkedin.com/in/vahid-dm/

[Index_Match]

How would the measure need to be adjusted if using a date table?

[parry2k]

@Index_Match solution attached, and core measure is this:

Repeat Customers = 
VAR __thisYearCustomer = VALUES ( Customer[Customer] )
VAR __lastYearCustomer = CALCULATETABLE ( VALUES ( Customer[Customer] ), PREVIOUSYEAR ('Calendar'[Date] ) ) 
RETURN
COUNTROWS ( INTERSECT ( __thisYearCustomer, __lastYearCustomer ) ) + 0

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