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rabiafarooq's avatar
rabiafarooq
Icon for Helper I rankHelper I
8 years ago
Solved

first occurrence of a value.

I have a table called Pharmacy_Issuance, in which i have to calculate the number of prescriptions for new or refills for certain medicines. So what i want to do is if the medical record number[MRN] o...
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  • v-yulgu-msft's avatar
    v-yulgu-msft
    8 years ago

    Hi rabiafarooq,

     

    Add an index column first. Then, create a new column like below:

    first occurrence check =
IF (
    CALCULATE (
        COUNTROWS ( Test1 ),
        FILTER (
            ALLEXCEPT ( Test1, Test1[MRN] ),
            Test1[Index] <= EARLIER ( Test1[Index] )
        )
    )
        > 1,
    0,
    1
)

     

    However, if there is a date column in your dataset, there is no need to add index column, you can directly refer to date field in above formula.

     

    Best regards,

    Yuliana Gu

v-yulgu-msft's avatar
v-yulgu-msft
Icon for Microsoft Employee rankMicrosoft Employee
8 years ago

Hi rabiafarooq,

 

Add an index column first. Then, create a new column like below:

first occurrence check =
IF (
    CALCULATE (
        COUNTROWS ( Test1 ),
        FILTER (
            ALLEXCEPT ( Test1, Test1[MRN] ),
            Test1[Index] <= EARLIER ( Test1[Index] )
        )
    )
        > 1,
    0,
    1
)

 

However, if there is a date column in your dataset, there is no need to add index column, you can directly refer to date field in above formula.

 

Best regards,

Yuliana Gu

  • Robert1981's avatar
    Robert1981
    Icon for Helper III rankHelper III
    6 years ago

    My table has 282,000 records. I tried the formula for the first occurence.

    But my machine can't finish the calculation

  • Anonymous's avatar
    Anonymous
    Not applicable
    5 years ago

    How can I dynamically check the first occurence when i change the date values in a slicer

    • Ashish_Mathur's avatar
      Ashish_Mathur
      Icon for Super User rankSuper User
      5 years ago

      Hi,

      Share some data, describe the question and show the expected result.

      • Anonymous's avatar
        Anonymous
        Not applicable
        5 years ago

        Hi,

        I need to create a dynamic column where the first occurance/flag column changes based on the slicer date range. Here's the sample data

        So, if I select the data range from March,2019 to August,2019 the resulted column should have only 4 rows and their first occurance flaged 1.

         

  • powerbifuddaa's avatar
    powerbifuddaa
    Icon for Helper II rankHelper II
    5 years ago

    Thank you for this. I have the same question. However "EARLIER" does not work when I try to use it.  Have no idea what I do wrong...I read on the internet that "EARLIER" is not recommended... Is there an alternative way to answer the same question (showing the first occurence of a number in a table). Thank you! 

    first occurrence check =
IF (
    CALCULATE (
        COUNTROWS ( Test1 ),
        FILTER (
            ALLEXCEPT ( Test1, Test1[MRN] ),
            Test1[Index] <= EARLIER ( Test1[Index] )
        )
    )
        > 1,
    0,
    1
)

     

  • cgallegos's avatar
    cgallegos
    Regular Visitor
    4 years ago

    Hi Yuliana, 

    Would you be able to help turn this formula so that it counts the number of occurance? For example, I'd want the second occurence of HIR to say 2 or the third occurance of DTA to say 3 for each employee ID. 

     

     

    Occurence = IF(CALCULATE(COUNTROWS('Records'),FILTER(ALLEXCEPT('Records','Records'[Empl ID],'Records'[Action]),
    VALUE('Records'[Effective Date - Job Dta])<=VALUE(EARLIER('Records'[Effective Date - Job Dta]))))>1,0,1)

     

    Thank you in advance!!

  • Anonymous's avatar
    Anonymous
    Not applicable
    2 years ago

    Hello, thank you so much for the answer.

     

    What if there are ties in the date and we would like to randomly choose one of the ties to flag it as first occurrence?