Tue, Jan 24, 2017
A A A
Welcome Guest
Free Trial RSS
Get FREE trial access to our award winning publications
New Managers May 2013

Peter Urbani' Statistics - Ignoring serial auto-correlation may understate hedge fund volatility by more than 30%

In a recent paper, Marcos Lopez de Prado of Hess Energy Trading Company and David H. Bailey of Lawrence Berkeley National Laboratory, derive closed form approximations for Expected Maximum Drawdown (MaxDD). They also derive formulae for the expected time to reach the Maximum Drawdown (t*) and the expected Maximum Time Under Water (MaxTuW), which under the assumption of IID Normality turns out to be three times the time taken to reach the maximum drawdown. Bailey and de Prado show that this Ãâ‚ËœTriple Penance Rule' holds independently of the Sharpe Ratio.

This has important consequences for people who may be using some combination of drawdown and Sharpe Ratio to stop out loss-making funds.

Moreover, Bailey and de Prado show that under the more general case, when first-order serial-auto-correlation is accounted for, the Triple Penance rule may no longer apply as the higher volatility of positively serial auto correlated funds may enable them to recover faster than 3 x the length of time it took the drawdown to occur.

They state,Ãâ‚Â We provide a theoretical justification to why investment firms typically set less strict stop-out rules to portfolio managers with higher Sharpe ratios, despite the fact that they should be expected to deliver superior performance. We generalize this framework to the case

of first-order auto-correlated investment outcomes, and conclude that ignoring the effect of serial correlation leads to a gross underestimation of the downside potential of hedge fund strategies, by as much as 70%. We also estimate that some hedge funds may be firing more than three times the number of skilful portfolio mana......................

To view our full article please login

This article was published in Opalesque's New Managers a top-down monthly analysis, news and research publication on the global emerging manager space.
New Managers
New Managers
New Managers

Today's Exclusives Today's Other Voices More Exclusives
Previous Opalesque Exclusives                                  
More Other Voices
Previous Other Voices                                               
Access Alternative Market Briefing

 



  • Top Forwarded
  • Top Tracked
  • Top Searched
  1. Investing - This hedge fund made 37% betting on banks in 2016 and remains bullish after the Trump rally, Hedge fund legend David Einhorn is making a big bet on GM, After impressive 85% return in 2016, hedge fund looks to Canadian gold producer, small banks[more]

    This hedge fund made 37% betting on banks in 2016 and remains bullish after the Trump rally From Forbes.com: Can bank stocks continue to rise after a 28% surge in the KBW Bank Index in 2016, fueled by a post-election rally as stock pickers returned to the beaten down sector? Forget the s

  2. SWFs - China sovereign wealth fund CIC plans more U.S. investments[more]

    From Reuters.com: China Investment Corporation (CIC), the country's sovereign wealth fund, is looking to raise alternative investments in the United States due to low returns in public markets, its chairman said on Monday. CIC will boost its investments in private equity and hedge funds as wel

  3. Some hedge funds strong start in 2017 nice contrast to 2016[more]

    With the 2016 HSBC Hedge Weekly performance rankings in the books - a year in which the same leader-board entries pretty much dominated unchallenged throughout the year - comes a new leader board that is a hard-scrabble mix of hedge fund styles and categories. What is clear after but a few short wee

  4. Macro hedge funds and CTAs outperform in December on strong dollar[more]

    Komfie Manalo, Opalesque Asia: The last month of 2016 saw risk assets climbing higher, as part of expectations that the new U.S. administration will remove barriers to growth and investment, Lyxor Asset Management said. December also saw the Fed hik

  5. Opalesque Exclusive: Roxbury credit events UCITS gathers more assets[more]

    Benedicte Gravrand, Opalesque Geneva for New Managers: The Roxbury Credit Events Fund, launched in September 2015, was up 4.24% in 2016, having returned seven positive months during the year. The managers raised