Quote from Pro_Trader720:
correction...
Sortio = ( AROR% - Risk Free % ) / Std. Dev. of negative asset returns.
http://www.investopedia.com/terms/s/sortinoratio.asp
What is considered a "good" Sortio number?
For example, I ran it for my fund since 1999 to the end of 2007, got 8.9 (using a 5% risk free ROR). Using it with the S&P, I got - .56.......