Roy shapre sortino sandwich return, excess, little

bchadwick

So sharpe starts it off..he's the man

port-rf/stnd dev = excess return per total unit of risk

then roy steps in and steals sharpe with a little tweak

port-minimum acceptable/stnd dev =

Then sortino jumps in and steals a bit himself from sharpe

port-rf/semi-deviation (same as downside dev)

nannan66

Sortino is port-MAR/downside dev

MAR could be rf though but not necessarily