Still need help here?
I found this unanswered post, and I can help if you need it.
Meh. I played with this and did it, whether or not you still need it.
[Did this change] tells me if there was a change. You'll only see this value get set to 1 in the second month (and subsequent months, if you go multiple months out.)
It uses the LOOKUP function that lets you look backward in the table.
Then I did [How many changed?], which sums up all the 1s on the sheet.
On the second sheet I used [Did this change] to filter the sheet. Only get those with a 1. Then I made calcs to display the previous rating and the notch.
Thanks for taking time out to take a look at this - much appreciated!