Cumulative distinct count filtered by last value - DAX

0 votes

I have a dataset:

month   name    flag
1       abc     TRUE
2       xyz     TRUE
3       abc     TRUE
4       xyz     TRUE
5       abc     FALSE
6       abc     FALSE

I want to calculate month-cumulative distinct count of 'name' filtered by last 'flag' value (TRUE). I.e. I want to have a result:

month   count
1       1
2       2
3       2
4       2
5       1
6       1

In months 5 and 6 'abc' should be excluded because the flag switched to 'FALSE' in month 5

Nov 18, 2020 in Power BI by anonymous
• 8,910 points
1,219 views

1 answer to this question.

0 votes
MyFilteredCumulativeMeasure =
COUNTROWS(
    FILTER(
        GENERATE(
            ALL( 'MyTable'[name] )
            ,CALCULATETABLE(
                SAMPLE(
                    1
                    ,SUMMARIZE(
                        'MyTable'
                        ,'MyTable'[month]
                        ,'MyTable'[flag]
                    )
                    ,'MyTable'[month]
                    ,DESC
                )
                ,FILTER(
                    ALL( 'MyTable'[month] )
                    ,'MyTable'[month] <= MAX( 'MyTable'[month] )
                )
            )
        )
        ,'MyTable'[flag]
    )
)

This works on your sample. Might need some tweaking for the real data. Also likely to slow down significantly as data size increases. I'll continue noodling on it, because this doesn't feel quite right, but it's a good naive implementation.

answered Nov 18, 2020 by anonymous
• 65,910 points

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