Hi again MJG. Thanks for kind words of encouragement on new rating system.
I do indeed have Mr. Martin's book, entitled "The Investor's Guide to Fidelity Funds - Winning Strategies for Mutual Fund Investing," where the retracement index (aka Ulcer Index) is introduced. It's a good book with several topics covered, including other risk measures, like beta and its relationship to theoretical Capital Asset Pricing Model (CAPM), which Prof Sharpe helped develop.
I thought it was interesting that when the book was first published in 1989, there was of course no mention of value or cap size parameters now recognized in the Fama/French three factor model. Think some day a momentum factor will be added? I believe Peter Martin and his co-author Byron McCann were both students of Prof Sharpe at Stanford, but have yet to confirm.
While the new return ratings key on Martin because of its sensitivity to both excess return and draw down, the risk ratings utilize three measures - standard deviation, downside, and Ulcer, which are the denominators of Sharpe, Sortino, and Martin, respectively.
Numerous risk and risk adjusted return measures have been developed, but Sharpe and Sortino certainly seem to be most popular, like you note. M* publishes these two along with beta, alpha, r-squared (correlation), Treynor, upside/down side capture. M* still has a place for something called "Bear Market Percentile Rank," which appeals to me, but its reference is so specific (the 5 year window) and is published so infrequently that I've stopped relying on it.
Other measures include Modigliani, Calmar, Sterling, and maximum draw down (MAXDD), which are tougher to find, like Ulcer and Martin. Maybe it's just because some of them are harder to calculate? I believe that the draw down measures are becoming more common in today's trading software programs.
After 2008, I think we all got more sensitive to draw down as a measure, but it's still not often published. For example, M* shows both gold rated funds DODGX and LLSCX performance at about -43% in 2008 or 6% below market. But they actually drew down nearly 60% by Feb 2009. MAXDD is included in the new MFO ratings tabulation, along with the Ulcer and Martin measures of draw down extent and duration. I suppose that given the choice, most folks would want to achieve comparable absolute return while experiencing less draw down. (But I'm heavy FAAFX, so I recuse myself from consideration.)
All these measures are so-called
ex post...historical, after the fact. Beta has been shown to have tendency to persistent, but certainly alpha does not. I believe CAPM predicts that those investing in riskier funds can expect higher returns over time. But has the debate been settled on whether there is an "optimal" risk level for a portfolio?
I personally think Ulcer Index and attendant Martin Ratio are best measures available for identifying funds that have delivered superior returns while avoiding draw downs. In addition to the previous references posted, here are a couple supporting opinions:
The Ulcer Index and
The Ulcer Index: A better measure of risk. (I tried searching for contradictory opinions but came up empty.)
I do find it gratifying that the new system highlights top notch 20 year funds, like VWINX, PRWCX, VWELX, OAKIX, SEQUX, YACKX, FMILX, MERDX, BCSIX as well as perhaps lesser known GLRBX, MAPOX, BHBFX, GASFX. In the forthcoming 10, 5, and 3 years ratings, you will find WRHIX, TGLMX, ARTKX, SGOVX, VILLX, PAAIX, TBGVX, PONAX, NSTLX, WBALX, WSCVX, MFLDX, PVFIX,
COBYX, AKRIX, AQMIX, VVPSX among the stand-outs.
Will their performance persist? So far so good, but your guess is probably better than mine regarding future. I do know that if Ulcer Index is creeping up on a fund I own, I'd want to know, especially if I expected it to maintain good down side behavior.
Our hope was that the MFO community would find the new ratings both unique and helpful, like the legacy Three Alarm system. The system is not all encompassing, as it emphasizes certain measures and is based strictly on historical numerical returns. No other due diligence performed. No assessment of fund shop, manager's strategy, style drift, stewardship, etc. Those assessments can be found in David's many profiles and commentaries, on the active MFO board, and elsewhere (like M* with premium membership).
Sorry for delayed response but have been a little busy lately and wanted to do the homework your posts often demand...to my betterment usually =).
Hope all is well and thanks again.