Hi @julien13b1 ,
I'm not clear about your requirement. Could you please provide some sample data(exclude sensitive data) and your expected result with calculation logic and specific examples? Thank you.
Just for example:
Sample data:
| Col1 | xxx | Colxx |
| aa | .. | 11 |
| bb | .. | 22 |
Expected result(include visual setting, calculation logic and correct values etc.)
I found some blogs about cohort analysis, you can watch or read them. Hope they can help you.
DAX for Power BI - Easy Cohort Analysis
Time Based Cohort Analysis – Setting Up Your Data Models In Power BI
Best Regards
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