an xts, vector, matrix, data frame, timeSeries or zoo object of asset returns
weights
portfolio weighting vector, default NULL, see Details
geometric
generate geometric (TRUE) or simple (FALSE) returns, default TRUE
invert
TRUE/FALSE whether to invert the drawdown measure. see Details.
p
confidence level for calculation, default p=0.95
...
any other passthru parameters
concept
drawdown
conditional drawdown
conditional drawdown at risk
References
Chekhlov, A., Uryasev, S., and M. Zabarankin. Portfolio Optimization With Drawdown Constraints. B. Scherer (Ed.) Asset and Liability Management Tools, Risk Books, London, 2003
http://www.ise.ufl.edu/uryasev/drawdown.pdf