DAX Formula to track year to year

[rmaxfield]

I am new to using DAX. I want to get the retention rate of students (identified with StuID) who return from one year to the next year, along with the number of students who do not return. To track a specific cohort, I need to use "Curr enr" codes F1 or F2 in year one, but the student will be code C during their second, third, and fourth year, etc. It needs to be a distinct count because there can be multiple StuID records within one Year. Could someone help me with a formula that will track students from one year to the next and help me find a retention rate?

[v-yangliu-msft]

Hi  @rmaxfield ,

I created some data:

Here are the steps you can follow：

1. Create measure.

Rank =
RANKX(
    ALL('Table'),CALCULATE(SUM('Table'[Year])),,ASC,Dense)

Measure =
SWITCH(
    TRUE(),
'Table'[Rank]=MINX(ALL('Table'),[Rank]),
CALCULATE(
    DISTINCTCOUNT('Table'[StuID]),
    FILTER(ALL('Table'),
   'Table'[Rank]=MINX(ALL('Table'),[Rank])&&OR('Table'[Current]="F1",'Table'[Current]="F2")))
,
'Table'[Rank]>=MINX(ALL('Table'),[Rank])+1&&'Table'[Rank]<=MINX(ALL('Table'),[Rank])+3,
CALCULATE(
    DISTINCTCOUNT('Table'[StuID]),
    FILTER(ALL('Table'),
   'Table'[Rank]>=MINX(ALL('Table'),[Rank])+1&&'Table'[Rank]<=MINX(ALL('Table'),[Rank])+3&&'Table'[Current]="C"&&'Table'[Year]=MAX('Table'[Year]))))

2. Result:

Best Regards,

Liu Yang

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly

[rmaxfield]

Hello, thank you so much for your data suggestion. Would you please explain what the second Measure (using SWITCH) will calculate for me in this dataset?

Also, I find no error in my formula, but my Measure is coming out blank.