Virgin: âWhat is the exact definition of this ratio?â
The Sharpe ratio can be calculated as the amount of:
Excess Returns divided by the Annualized SD of Account Returns (ER / ASDAR)
Where:
ER = Annualized Account Return - Risk Free Return (AAR - RFR)
RFR = A risk free investment such as a T-Bill
There are more complex methods that may, for instance, alter the SD calculation or use projected returns.