Risk adjusted returns based on Drawdown risk

DrawdownAdjustedReturns.py

"""
Note that this Gist uses functions made available in another Gist -
https://gist.github.com/StuartGordonReid/67a1ec4fbc8a84c0e856
"""


def calmar_ratio(er, returns, rf):
    return (er - rf) / max_dd(returns)
 
 
def sterling_ration(er, returns, rf, periods):
    return (er - rf) / average_dd(returns, periods)
 
 
def burke_ratio(er, returns, rf, periods):
    return (er - rf) / math.sqrt(average_dd_squared(returns, periods))