Customer Retention Calculation Over Successive Weeks

Good morning!

Using CALCULATETABLE isn't mandated.  Need to find those users that logged in in each of the six weeks and I can certainly try this out.  Was hoping that I could avoid having to list out each successive week but I may not be able to.

I found this article by marcorusso on implementing compound interest.  Compound interest calculations have to build on successive periods so I thought I would try it, but not hopeful that it would work because the formula would return values for periods and not groups of users/IdentityIDs from each period.  That's really where it gets stuck...

Thanks for looking at it again.