Not even going to attempt to wrap my head around that formula. It’s easier for me to understand something when I can apply it to my own situation. I just wanted to offer some additional information. Doesn’t quite apply to your situation, but it’s a good formula to keep in the back of your mind. The attached thread shows how to find the last record that matches a search term. It’s good if you just need to find that last submission for a particular user, but not as useful for a poll.