Can you figure out your overall edge with PokerTracker?

[Pokerlogist]

Why is "edge" not the the same as ROI in ring poker? Maybe it is just semantics. You simply take the net cash won and divide it by the total amount of cash bet (risked). It is not normally computed for ring poker but it seems like it would be a valid and useful statistic. BTW I'm pretty sure you can only get ROI or edge in ring games from PT by using an SQL script.