Thanks, Darren. I had this feeling that I had seen something like that recently, but couldn't find how to get to it. Thanks for clarifying. Feeling a bit dumb at the moment, to be honest. Still holding out a little hope that I can turn this into a request for a specific type of calculation/statistic. 
No need to feel bad, Rui. Tana has a lot of features, it's easy to miss them sometimes.