Date: 07-Jan-98 - 8:05 PM
Subject: RE: How does MER affect the performance of a fund
From: thbox
jd:
Sorry, there are no hotlinks in this - maybe next time, and thanks again for your help.
Let's start with your final set of propositions - that annual data provides an informationally more complete picture of overall characteristics. First, I fail to see why 12 month returns based on calendar years is somehow more significant and "informationally complete" than 12 month returns based on some other fiscal year. I recognize the argument that if a manager doesn't beat the average consistently over 10 calendar years, there is no point in looking at (say) Nov - Nov returns, but if pedantry is your preferred style, you need to insulate your argument a little better
While I agree that compound return obscures a good deal of information, it doesn't follow at all that it is always less useful than compound returns. You're right that you can calculate CAR from annual returns, and not vice versa, but so what. That fact doesn't bear on the argument for, or against, the utility of compound returns in the context of evaluating long-term performance. The utility of CAR is precisely that it allows easy comparisons of returns over periods greater than one year. Since my basic assertion was that it is a manager's long-term record that is relevant, rather than his/her performance over discrete annual periods, I don't see how looking at annual returns rather than CAR might advance the process. You can slice and dice the data differently if you want, but I'm impressed by a manager who manages to beat the index (or the average - take your pick) consistently over 10 year periods. The criterion of beating the average consistently over calendar years seems unnecessarily demanding. Its sort of like acknowledging that even the best managers can make a mistake every now and then without entirely denying their skill.
You want to make a great deal of the analogy between coin-flipping and portfolio management performance. This sort of activity was popularized by Burton Malkiel (of Random Walk fame), but it is worth more than mere mention that Malkiel has largely renounced his efficient market hypothesis (EMH). There are two intellectual threads here.
There is a world of difference between flipping a coin and portfolio management. (I suspect Vito Maida is wishing just about now that the difference wasn't so grand.) In coin flipping, there are two outcomes: head or tails; black or white. In the real world though the Great Designer (I wonder if he's related to Versace) likes to paint in shades of grey. As Brimelow points out in his analysis of investment letters (a la Hulbert),
....EMH proponents have a suspicious tendency to vagueness when it comes to specifying to what exactly their coin flip is analogous. Is it the odds of a successful stock pick…or the chance that a whole portfolio will appreciate? If the odds of the former are 0.5, the odds of the latter, assuming equal allocation between the stocks must be 0.5 RAISED TO THE POWER OF HOWEVER MANY STOCKS ARE IN THE PORTFOLIO. This makes an appreciating portfolio much more of a feat. Similarly it makes a vast difference to the probability calculation whether the coin flip represents price action over a day or various combinations of days, such as a year or five years….
One of the most compelling arguments against EMH is that the past movements of the market as a whole can provide no more evidence of the market's future movements than the past movements of individual securities can of their future movements. Yet the evidence OVERWHELMINGLY indicates that the LONG TERM movements of the market exhibit remarkable stability. Over the past two hundred years, the average return on equities has been 10%, or to put it another way, the long-term risk premium on equities has been remarkably stable at (about) 7-8%. How come? Why is it that the "market" isn't as smart as its constituent elements?
You are correct - 30 years of data is difficult to come by. The most commonly referred-to case is that of the Value Line Investment Survey, which has operated since 1965. The consistency of this survey's ability to identify investments which outperform has been remarked on numerous times, and even Nobel Laureate Fischer Black (of Timmons fame) - who is an avowed disciple of EMH - concedes his amazement. Does one instance make a case? Of course not? But since the argument of EMH is that the market cannot be beaten (on a risk adjusted basis) over the long term, it is clear to me that EMH is wrong, even though the methodology for identifying the prospective winners is rudimentary or deficient, or both.
My view, and it is only my view, is that the best way to identify propsective outperformers is to look at a MANAGER'S record, for its discipline and consistency rather than the simple scope of its past outperformance. Consistency is hard enough to quantify, and discipline is even harder, but the methodological difficulties do not preclude the validity of the hypothesis. As I indicated at the outset, I continue to believe that a track record of 15+ years is a good start. As a betting man (you must be, if you think coin-flipping reveals useful data), you have to acknowledge that the probability of outperforming over 15+ years by luck alone is lower than the probability of outperforming over 3 years. Bill Berger has cautioned: "Don't confuse brains with a bull market" and in the light of the past five years, the ability of a manager to weather the bears of '87 and '90 (never mind 94 - it wasn't big enough) IS important, despite the disparagemernt of the coin flippers of the world….
On a lighter note, I was particularly fascinated by the statistical argument that since the overwhelming majority of people have more than the median number of legs, statistics must be a pseudo-science. I suspect he used both of his to come up with that view….
regards for now
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