Strat-O-Matic Baseball 365

I originally made a post asking what TTO% is, but I quickly found the answer, so I deleted my original post. (TTO% is November's monthly challenge.) However, I thought others might also be wondering, so here is the answer:

Three True Outcomes Pct. (offense) in a 162-game regular season!
- TTO% = (HR + BB + SO) / PA