Forum Discussion

JoSwinnen's avatar
JoSwinnen
Icon for Helper I rankHelper I
4 years ago
Solved

Average duration between two dates is not calculated

Hi,   I have a dataset with multiple lines for one student. For each year he is stuying at the university a line is created with his registrationdate of that year and his deregistrationdate of that...
Need Help
  • tamerj1's avatar
    tamerj1
    4 years ago

     
    actually when I saw your reply I had a 2nd look at the solution and the results. 
    In your report you are slicing by 'vw_powerBI'[stamnummer] which means that the filter context contains the table of each student and there is no need to CALCULATETABLE - ALLEXCEPT. Therefore, the VALUES ( 'vw_powerBI'[Graduated?] ) should contain all the "Yes" and "No" values for each "stamnummer". The limitation I set is: IF at least one "Yes" is available for the current student then do the calculation otherwise return blank. I see no reason why this shouldn't work.

    However this condition need to be applied inside the SUMX as well in order to limit the total average (In the column total cell) to only the students who have "Yes" in their Graduate status. 

    Study duration =
IF (
    "Yes" IN VALUES ( 'vw_powerBI'[Graduated?] ),
    AVERAGEX (
        VALUES ( 'vw_powerBI'[stamnummer] ),
        IF (
            "Yes" IN CALCULATETABLE ( VALUES ( 'vw_powerBI'[Graduated?] ) ),
            DATEDIFF (
                CALCULATE ( MIN ( 'vw_powerBI'[registrationdate] ) ),
                CALCULATE ( MAX ( 'vw_powerBI'[deregistrationdate] ) ),
                DAY
            )
        )
    )
)

     

    JoSwinnen

JoSwinnen's avatar
JoSwinnen
Icon for Helper I rankHelper I
4 years ago

Thanks. This one gives a better result. 

The dataset looks like this:

Studentnumber       RegistrationDate      DeregistrationDate     Graduated?

00001                            15/09/2019               30/06/2020                No

00001                            15/09/2020               30/06/2021                No

00001                            15/09/2021               30/06/2022                Yes

00002                             15/09/2020              30/06/2021                  No

00002                             15/09/2021              30/06/2022                  No

00003                              ...

 

So the formula above may only work when there is one row with a yes for that student. Students who tried but did not graduated (only no's) cant be included in the calculation. 

 

Thanks,

 

Jo 

tamerj1's avatar
tamerj1
Icon for Community Champion rankCommunity Champion
4 years ago

JoSwinnen 
Please try

 

Study duration =
VAR Graduated =
    CALCULATETABLE (
        VALUES ( 'vw_powerBI'[Graduated?] ),
        ALLEXCEPT ( 'vw_powerBI', 'vw_powerBI'[Studentnumber] )
    )
RETURN
    AVERAGEX (
        VALUES ( 'vw_powerBI'[studentnumber] ),
        CALCULATE (
            IF (
                "Yes" IN Graduated,
                DATEDIFF (
                    MIN ( 'vw_powerBI'[registrationdate] ),
                    MAX ( 'vw_powerBI'[deregistrationdate] ),
                    DAY
                )
            )
        )
    )

Or 

Study duration =
VAR CurrentStudentTable =
    CALCULATETABLE (
        'vw_powerBI',
        ALLEXCEPT ( 'vw_powerBI', 'vw_powerBI'[Studentnumber] )
    )
VAR FiteredTable =
    FILTER ( CurrentStudentTable, 'vw_powerBI'[Graduated?] = "Yes" )
RETURN
    AVERAGEX (
        FiteredTable,
        DATEDIFF (
            MIN ( 'vw_powerBI'[registrationdate] ),
            MAX ( 'vw_powerBI'[deregistrationdate] ),
            DAY
        )
    )

 

  • JoSwinnen's avatar
    JoSwinnen
    Icon for Helper I rankHelper I
    4 years ago

    Hi,

     

    I've tried both ways, but it all gives the same result. The study duration for each student graduated or not... 

    Thanks,

     

    Jo 

    • tamerj1's avatar
      tamerj1
      Icon for Community Champion rankCommunity Champion
      4 years ago

      JoSwinnen 

      Please try

      Study duration =
VAR Graduated =
    CALCULATETABLE (
        VALUES ( 'vw_powerBI'[Graduated?] ),
        ALLEXCEPT ( 'vw_powerBI', 'vw_powerBI'[Studentnumber] )
    )
RETURN
    IF (
        "Yes" IN Graduated,
        AVERAGEX (
            VALUES ( 'vw_powerBI'[studentnumber] ),
            CALCULATE (
                DATEDIFF (
                    MIN ( 'vw_powerBI'[registrationdate] ),
                    MAX ( 'vw_powerBI'[deregistrationdate] ),
                    DAY
                )
            )
        )
    )
      • JoSwinnen's avatar
        JoSwinnen
        Icon for Helper I rankHelper I
        4 years ago

        Thank you for trying, but it still gives the same result.