Retention Rate by program

[asuprunova]

I have a file for students' first-year program and the second-year program. I need to calculate the retention rate which will be a count of students' IDs for the first-year program divided by students who kept with the same program in the second year. For instance, in accounting, I had 66 students in the first year, and out of the 66, I had 39 who stayed in a program. But some students change the program to accounting so if we only count second-year accounting we will get 51. But I need 39/66. I tried grouping, splitting tables, and all except but nothing seems to work. 

Link to file test: https://docs.google.com/spreadsheets/d/e/2PACX-1vQES4GPwGPOtsSg8PXxOIl7jHAB9oNvmj2jihUjoH0gtr-Bb2f1P... 

[VilmarSch]

Veja se ajuda

PBIX here

[amitchandak]

@asuprunova , You have to follow an approach like below, your current vs past can based on year or semester, use a separate table to build that

Customer Retention Part 1:
https://community.powerbi.com/t5/Community-Blog/Customer-Retention-Part-1-Month-on-Month-Retention/b...
Customer Retention Part 2: Period over Period Retention :https://community.powerbi.com/t5/Community-Blog/Customer-Retention-Part-2-Period-over-Period-Retenti...