Calculating Sharpe Ratio

Hey guys I have calculated my daily sharpe ratio but I think that I have probably done something wrong. I am particularly concerned about the Risk free rate. Would be grateful if someone could check it over:

Standard deviation: 5.14
Mean Return: 1.69
Risk free rate: 0.4447

Daily Sharpe: 0.24
Annualized Sharpe: 3.86

Does this look right? For the ROR I basically used the yeild on the 3 month Tbills which is 3.53 and then multiplied it with the squareroot of 1/63 (63 trading days per 3 months so this should give the daily rate).

Is this correct? Thanks.
 
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