This function computes the Sharpe ratio of the univariate time series
(or vector) x.
Usage
sharpe(x, r = 0, scale = sqrt(250))
Value
a double representing the Sharpe ratio.
Arguments
x
a numeric vector or univariate time series corresponding to a
portfolio's cumulated returns.
r
the risk free rate. Default corresponds to using portfolio
returns not in excess of the riskless return.
scale
a scale factor. Default corresponds to an annualization
when working with daily financial time series data.
Author
A. Trapletti
Details
The Sharpe ratio is defined as a portfolio's mean return in excess of
the riskless return divided by the portfolio's standard deviation. In
finance the Sharpe Ratio represents a measure of the portfolio's
risk-adjusted (excess) return.