Forum Discussion

ironboy0418's avatar
ironboy0418
Icon for Helper II rankHelper II
3 years ago
Solved

What is the additional if statement that will return the first-non zero value from previous row?

I am currently doing a COVID-19 reports/dashboard through Power BI. I have this dax formula that will return the new cases for each day. However, the problem with this formula is that I am not able to return the value of the first case - it returns 0. May I ask for suggestion on how to make this formula return the value of first case as well?

 

Datasource: https://github.com/CSSEGISandData/COVID-19/blob/master/csse_covid_19_data/csse_covid_19_time_series/time_series_covid19_confirmed_global.csv

 

Source code:

New_Cases = 
VAR Countries = ConfirmedCases[Country/Region]
VAR State = ConfirmedCases[Province/State]
VAR dates = ConfirmedCases[Date]
VAR PrevDay =
CALCULATE(
    MAX(ConfirmedCases[Cases]),
    FILTER('ConfirmedCases',
    ConfirmedCases[Country/Region]=Countries && ConfirmedCases[Province/State]=State && ConfirmedCases[Date]<dates))
RETURN
IF(PrevDay=0,0,
IF(PrevDay>[Cases],0,
IF(PrevDay>0,[Cases]-PrevDay)))

Here is the current output: 

 

  • ironboy0418's avatar
    ironboy0418
    3 years ago

    We got the answer! Sharing the appropriate solution:

     

    New_Cases =
    VAR Countries = Confirmed_Cases[Country/Region]
    VAR State = Confirmed_Cases[Province/State]
    VAR dates = Confirmed_Cases[Date]
    VAR tbl =   FILTER('Confirmed_Cases',
        Confirmed_Cases[Country/Region]=Countries && Confirmed_Cases[Province/State]=State && Confirmed_Cases[Date]<dates)
    VAR PrevDay =
    CALCULATE(
        MAX(Confirmed_Cases[Cases]),
         tbl)
    RETURN
    [Cases] - PrevDay

3 Replies

  • amitchandak's avatar
    amitchandak
    Icon for Super User rankSuper User
    3 years ago

    ironboy0418 , Previous date when cases were 0 (New column)

     

    New_Cases =
    VAR Countries = ConfirmedCases[Country/Region]
    VAR State = ConfirmedCases[Province/State]
    VAR dates = ConfirmedCases[Date]
    VAR PrevDay =
    CALCULATE(
    MAX(ConfirmedCases[dates]),
    FILTER('ConfirmedCases',
    ConfirmedCases[Country/Region]=Countries && ConfirmedCases[Province/State]=State && ConfirmedCases[Date]<dates && ConfirmedCases[New_Cases]=0))
    RETURN
    PrevDay

     

     

    1st date when case were 0

     

    New_Cases =
    VAR Countries = ConfirmedCases[Country/Region]
    VAR State = ConfirmedCases[Province/State]
    VAR dates = ConfirmedCases[Date]
    VAR PrevDay =
    CALCULATE(
    Min(ConfirmedCases[dates]),
    FILTER('ConfirmedCases',
    ConfirmedCases[Country/Region]=Countries && ConfirmedCases[Province/State]=State && ConfirmedCases[Date]<dates && ConfirmedCases[New_Cases]=0))
    RETURN
    PrevDay

    • ironboy0418's avatar
      ironboy0418
      Icon for Helper II rankHelper II
      3 years ago

      Thanks amitchandak! Do I need to create two columns for these?

  • ironboy0418's avatar
    ironboy0418
    Icon for Helper II rankHelper II
    3 years ago

    We got the answer! Sharing the appropriate solution:

     

    New_Cases =
    VAR Countries = Confirmed_Cases[Country/Region]
    VAR State = Confirmed_Cases[Province/State]
    VAR dates = Confirmed_Cases[Date]
    VAR tbl =   FILTER('Confirmed_Cases',
        Confirmed_Cases[Country/Region]=Countries && Confirmed_Cases[Province/State]=State && Confirmed_Cases[Date]<dates)
    VAR PrevDay =
    CALCULATE(
        MAX(Confirmed_Cases[Cases]),
         tbl)
    RETURN
    [Cases] - PrevDay