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Bill Gross of Pimco says Keep a Sharpe Eye on Future Risk

This is a report I have access to that you should know about:
Bill Gross of Pimco says Keep a Sharpe Eye on Future Risk
By Bill Gross
Apr 03,2014 04:00 PM
There is a tragic end to all living things: They stop living. Our Maine Coon “Kitty” of 14 years stopped living last week. Her name was “Bob,” and one of the sweetest animals that anyone could have had. I don’t think she minded having a boy’s name, at least she never mentioned it. We brought her home one afternoon after visiting our 3rd cat show in as many months and asked the inevitable question – what shall we name her? Struggling for an appropriate label for a brown and black cat that to be honest looked more like a dog, and having just seen the Richard Dreyfuss and Bill Murray comedy of the same name the night before, I said “What about Bob?” We all laughed, but it stuck. She was Bob.

Aside from sleeping, Bob loved nothing more than to follow me from room to room making sure I was OK. It got to be a little much at times, especially when entering and exiting the shower. I’m not a particularly shy guy, but then why was a female cat named Bob checking me out all the time? Her obsession carried over to the TV, sensing when I was on CNBC and paying apt attention no less. I often asked her about her recommendations for pet food stocks, and she frequently responded – one meow for “no,” two meows for a “you bet.” She was less certain about interest rates, but then it never hurt to ask.

But before Bob, there were a number of loving pets in the Gross household. Most of you have had some as well; loved, and then lost them. For the Grosses there was Honey the golden retriever of all time, or at least the 20th century champion. She roamed the neighborhood in the more relaxed 1980s, bringing home stale loaves of bread like they were floating ducks on a pond. It wasn’t the bread so much (although it was that), as it was the praise for a good “find” and a pat on the head. Honey also loved rocks, some so big that it seemed her jaws would crack from the weight. Retrievers love retrieving, even if they’re loaves of bread or rocks. And then there was Wiggles and Daisy and Budgie – lovable pets every one of them and perhaps just as importantly – pets that loved us. I know you’ve had some too. So here’s to them and here’s to Bob. We buried her ashes in the backyard. Her gravestone reads just – “Bob.” What a girl, what a kitty girl that Bob.

Stanford’s Professor Emeritus William Sharpe was one of the originators of the capital asset pricing model, a class I took on the way out the door at UCLA’s Anderson School of Management and barely passed. A “C-” in business school is really an “F.” Guess I flunked it. He had another idea later known as the “Sharpe ratio” or, as amended, the “information ratio.” His logic said that higher returns from riskier assets such as stocks or high-yield bonds must in some way be measured against their up and down volatility, and his ratio tries to do that for entire asset classes measured against Treasury bills as well as individual portfolios measured against various indices. The higher the Sharpe ratio the better in general, and a ratio of .5 was generally considered an acceptable measure of an asset’s expected return vs. Treasury Bills or a manager’s ability to outperform an index over time via the “information ratio” hybrid.
Chart 1, courtesy of an exhaustive study by CreditSights, shows Sharpe ratios for various asset classes over the past 15 years. All assets shown in the chart exhibited positive Sharpe ratios. In a sense this is just a history lesson. The chart says that even when volatility (risk as commonly accepted) is accounted for, when those sleepless nights during 2000’s dotcoms or the panic of 2009 is factored into the wrinkles on your aging face, that you were better off holding anything but cash. Well yes, such is the long-term history of capital markets as we know them. “Assets for the long run” would make for a thin but rather informative book. Write one!

But on one of those thin pages the prospective author should introduce the caveat that the past 15 or even 30 years have been a rather remarkably short and nonvolatile period of time, and future Sharpe ratios or other measures of risk/return may not exceed Treasury bills in the same amount as before. A rather familiar graph of 10-year Treasury yields as shown in Chart 2 would hint at this. What I hope the reader will note is not only the dramatic decline in yields since the early 1990’s but the relative linear (non-volatile) path that they followed. Granted, for other asset classes such as stocks, there was 1987 and the aforementioned dotcoms and subprimes, but the linear path is clear: higher asset prices over long periods of time generated in part by the steady decline of 10-year Treasury yields to a 2012 bottom of 1.39%. A Bull Market almost guarantees good looking Sharpe ratios and makes risk takers compared to their indices (or Treasury bills) look good as well. The lesson to be learned from this longer-term history is that risk was rewarded even when volatility or sleepless nights were factored into the equation. But that was then, and now is now.
So wait! There comes a point where prospective returns relative to risk don’t ensure such optimistic outcomes. While there’s always an element of subjectivity to all predictions – future profit margins, forward Shiller P/E’s?, normalized real interest rates, geopolitical rest/unrest, etc. – there should be at least some objectivity and common sense.

Chart 3, provided by CreditSights as well (good firm), provides a basis for that common sense.

In the bond market, there is a measure of risk/return known as “yield per unit of duration.”

Duration is a standard measure of price risk relative to interest rate changes – the lower duration the less the price change (generally). But shorter duration (maturity) bonds usually have lower yields!

This doesn’t seem to be very helpful for a bond investor at first blush. It implies that if you want more return than a Treasury bill and a positive Sharpe ratio, then extend your duration. Yet “how much to extend?” would be an active manager’s question. Chart 3 provides some perspective although as noted, no positive conclusions, other than today is different than the past 15 years!
What Chart 3 implies is that today’s reward relative to risk – yield per unit of duration is more or less half of what it has been for the past 15–20 years. In order to get the same yield today for a single unit of duration for AAA, BBB, and HY bonds, an investor has to take twice the price risk! Since duration and correlated maturities are simply measures of interest rate risk, that may simply be pointing out that yields are historically low, and yes – they still are. But in order to capture other elements of return such as credit, curve, volatility and currency, the average bond investor must generally attach those elements of “carry” to a bond with a duration. Swaps, CDS, and FRN’s provide a partial escape but for the cash investor, today’s yield per unit of duration is only half of the markets’ 15–20 year historical measure, and that is very, very low, dear reader.

How to confront this? There are at least two ways at the extreme, I suppose. Either double your position – double your duration – and maintain the same yield as historically noted or maintain or even lower your duration as a concession to an overpriced market that may continue to suffer increasing yields and lower prices. Do you want to “double up to catch up” as Vegas blackjack dealers used to encourage me, or are you willing to suffer the lower yields, wait for “mean reversion” as do some of our competitors, and hope that the client cash outflows don’t cash you out before you have a chance to play another game? Future Sharpe ratios and investment management firms hang in the balance.

Well, as Bill Sharpe’s contemporary Harry Markowitz? pointed out long ago, investing is a process of compromises involving diversification, and many times the compromise provides a return relative to risk that is more “efficient” than any other. If a portfolio were to seek a high Sharpe ratio using a Markowitz efficient portfolio, what might it look like today?

 
PIMCO recommends overweighting credit and to a lesser extent volatility and curve. Underweight duration. Although credit spreads are tight, they are not as compressed as interest rates, which are now in the process of normalization. While PIMCO agrees with Janet Yellen that such normalization will be a long time coming (the 12th of Never?), probabilities suggest that as the Fed completes its Taper, the 5–30 year bonds that it has been buying will have to be sold at higher yields to entice the private sector back in. The 1–5 year portion of the curve, beaten up recently due to Fed “blue dot” forecasts and Yellen’s “six months after” comments, should hold current levels if inflation stays low, but 5–30 year maturities are at risk. Overall, because 2014 should be a relatively positive growth environment, carry trades in credit, curve and volatility should produce attractive Sharpe/information ratios. Return expectations however, for all unlevered assets and Markowitz generated portfolios will be in the low- to midsingle digits.

And what would Bob have meowed? Well, like I wrote, she was always more certain about pet food stocks, but then maybe kitty heaven has given her some additional insight. I shall have to ask her in my dreams. Sometimes dreams come true you know.

“Bob” Speed Read

1) High Sharpe ratios have been due to a long-term bull market. They will be lower in future years, as will asset returns.

2) Yields per unit of duration are historically low – half of their 15–20 year averages as shown by CreditSights.

3) Favor credit spreads and to a lesser extent, curve and volatility carry trades.

4) Treasure your pets and all living things. Eventually we all stop living.

William H. Gross
Managing Director ?Details

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Now creating super C++ API for HFT. Adding moving average, parameter sweeping, lead lag, grid optimization, Sharpe, and more!

Now creating super C++ API for HFT. Adding moving average, parameter sweeping, lead lag, grid optimization, Sharpe, and more!

Now that I have code generated the moving average algorithm from Matlab to C++, I will be testing to code generate the implementing and supporting code. This includes source code that does:

parameter sweeping

lead lag functionality

grid optimization

and Sharpe Ratio calculation

These are some of the functionality I will be adding to this NEW super C++ API being built for my HFT system. This will be added to the membership download C++ source code files once complete.

Wish me luck!

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Strategy out of an academic paper. 16.5 % return at 2.36 sharpe, max drawdown 6.9% through 1999-2010. Is this good, medium or bad?

Strategy out of an academic paper. 16.5 % return at 2.36 sharpe, max drawdown 6.9% through 1999-2010. Is this good, medium or bad? Equity curve, year by year statistics and relative performance here

https://docs.google.com/file/d/0B3NaiGhKcKu0NTVmNjA4YmItYjA5Zi00ZWQ3LWJiY2MtZDlmNDEzN2IzNWI5/edit?hl=en_US&authkey=CNbSt6QC&pli=1

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Looks ok, but really these 2 pages does not give much information.

Hss this been verified by independent auditors, or is this backtest results? if this is backtest results, then I have seen a lot like it.
You say this is an academic paper. Is this present and open source?

Nice graph though 🙂

 

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The strategy (implemented out of sample) above is based on the two papers below

http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1340879http://www.futuresmag.com/Issues/2011/May-2011/Pages/Capturing-backwardation.aspx?page=1

Adding the dynamic S&P strategy to the dynamic commodity strategies results in a significant reduction in volatility.

 

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You are right the 2 pages give much information. What else would you like to know?

These are backtest results or you could say paper traded results for a while ago..

 

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I skimmed through the above article and would say that your results seem pretty realistic. I missed the part in the paper where you have a sharpe of 2.36 not sure if that was for all ten years or your best year. Looks to me like for an active strategy applied to a particular commodity the sharpes are between 1 an 1.5. Incidentally I have an intermediate strategy for ETFs that produces somewhat similar results ie active management does better than long only posns and sharpes in the same range as you. What happens if you toss out your most volatile commodities from the mix and instead of having ten use say the least volatile 5-7. Just curious I am going to review your paper more closer it looks pretty good.

 

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sorry i did not read the google docs paper first so now i see where the 2.36 comes from
(a) how were the weights chosen
(b) if you are shorting assets do you adjust the sharpes in any way to account for the short position ie is sharpe still appropriate measure for a long/short basket as opposed to long only or would you use an adjusted sharpe.

Initially I skimmmed your other papers

 

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Thanks for your interest
(a). The strategy is a combination of 3 equally weighted strategies (2 for commodities, 1 – S&P 500). Weights are chosen on equal weighting principles rather using mean-variance optimization on historical data.

(b). Our sharpes are simply calculated as the ratio of (Mean return – risk free) and (sigma of return). I see your point about sharpe for shorts, because return (or more specifically ROI in this case) would change for a short position.

Other statistics of our strategy is that for the 11 year period, it the maximum weekly loss was -2.39 percent and there were only 4 occasions when return was less than -2%. And also only 25 weeks when return was greater than 2%.

 

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the papers you posted were very interesting. Thank you for posting them.

 

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For some reason I can’t view\download the pdf from Google Docs. Any way, to be concrete, On a simple scale of bad, fair, good then 6.9% is good, 16.5% is fair and 2.36 sharpe is also fair (that is, if you’re after setting up your own hedge fund).

 

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Thanks for the reply. Wonder why arent you able to access the google docs document. I can email it you if you like?

 

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The results are too good to be true. The Devraj Basu and Alexander Stremme paper uses data from 1993-2007 to find a suitable model and the uses 1993-1998 to estimate the predictive model and then used the 1999-2007 as out of sample data. It is like not having any out of sample data at all. I wonder what was the performance during 2008-2011.
From my experience strategies that uses linear regressions would show performance with long periods of really good and really bad performances.

 

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The performance of the backtest over 2008-2010 is given in the document attached to the comment. The Sharpe ratios were 2008: 1.80, 2009:4.71 2010:2.02. For 2011 the strategy was up around 5% until the end of June. THe statement that the Basu and Stremme paper used data from 1993-2007 to find an appropriate model is not entirely accurate. An unconditionally efficient portfolio strategy was chosen ahead of time and the in-sample period was used for parameter estimation via the predictive regression and the fitted model was then evaluated out of sample.In effect it could have been run in real time.

 

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I wasn’t clear enough. I would like to see the performance of the strategy only for SP500 during 2008-2011. You are right my statement is not entirely accurate but I see an issue related to variable selection (Why COT+VIX ?) using the entire sample.

 

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the email with links to this article was dumped into spam (i use gmail) because it said it has text frequently used by spamers. i see what they are talking about with those cheap air jordan ads.

 

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How large of leverage do you use?
thx..

 

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which platform u r using for doing back testing and how robust is ur platform..

 

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Thanks for sharing the papers. I was wondering how did you back test this system? Did you back tested from 1999 – 2010 or year by year ( 1999- 2000, 2000 – 2001, 2001- 2002,etc), You may get completely different results.

 

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Get a sharpe ratio of 2 or more, the capital starts flowing

It seems I I got a confirmation on the previous post, but the magic number on sharpe seems to be about 2. Prove it with your in house processes with tech and strategies, the capitlal will star flowing. You probably could start your own equivalent hedge fund once you get to a certain level. It gets kind of exciting when you think about it,

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