Climate shifts are in principle unpredictable — but I suggest that a cooler state space is more likely on the basis
of reversion to the mean.
Understanding and using the phenomenon
of reversion to the mean is essential in making sound predictions [decisions]... Reversion to the mean is most pronounced at the extremes, so the first lesson is to recognize that when you see extremely good or bad results, they are unlikely to continue that way.
-LSB-...] investors refer to contrarian investing as a phenomenon that takes advantage
of reversion to the mean.
Pure contrarian investing is investing relying solely on the phenomenon
of reversion to the mean without making an assessment of value.
I mentioned earlier the concept
of reversion to the mean (in «Achieving Greater Long - Term Wealth Through Index Funds,» AAII Journal, June 2014); it happens, it's documented decade after decade.
Index investors, in aggregate, are likely to realize higher returns because of lower costs and the effect
of reversion to the mean on active strategies.
Such active errors do not negate however the phenomenon
of reversion to the mean.
Are you familiar with the concept
of reversion to the mean?
«There is an innate tendency
of reversion to the mean.
Not exact matches
There is going
to be a
reversion of the
mean,» Orlando said.
It's one
of the most basic rules in economics:
Reversion to the
mean.
Gold has 5000 years
of history behind it as currency, blink and you might miss the
reversion to the
mean of Gold being money again.
I'm actively looking at my debt and determining if it makes more sense
to pay down mortgages (locking in a guaranteed ~ 4 % return) or investing in bonds (~ 1 % returns if held
to maturity) or stocks (uncertain, but I just wrote an article about the current PE ratio and the inevitable
reversion to the
mean and I believe we are likely headed for 10 years
of low single digit returns).
The growing possibility
of mean reversion in the U.S. Consumer Staples, Telecommunications, and Utilities sectors is something that we believe baby boomers in particular may want
to keep in mind.
This recent turn
of events favoring international equities over U.S. equities could point
to the early makings
of a
mean -
reversion following years
of outsized gains for U.S. equities.
If you apply the principle
of mean reversion, history appears
to favor China landing on top during this Year
of the Dragon.
From a «consensual positioning» perspective which touches on this current «
mean -
reversion dynamic in the marketplace: say this big bond rally were
to gather steam into a much more punishing squeeze
of the «all - time» UST short base (largely due
to the previously mentioned lack
of «tolerance» for beginning
of year performance pain).
It's just a matter
of time before we see a
reversion to the
mean in which housing prices revert back
to the true fundamental condition
of the middle class in this country.
Bogle, 87, called me from his Vanguard office at Valley Forge, Pa., on Wednesday
to discuss the hedge - fund redemptions, which he attributes
to a surge
of competition in the sector and the inevitable «
reversion to the
mean» for returns.
2) By extending the projection horizon by an extra market cycle (~ 6 years - the current half - cycle is quite long - in - the - tooth from a hisorical perspective) the effect
of mean reversion has a greater chance
to dominate the occasional noise that emerges (e.g. during the tech bubble) over shorter horizons.
I operated in the world
of supply and demand which translates into
reversion to the
mean for an investor.
It's possible we're facing the final stage
of this particular economic cycle, as a majority
of fund managers suspect, but
mean reversion could eventually bring conditions back
to «normal.»
Clearly, adding a small out -
of - range segment
to a normally
mean - reverting chart can make it look (at least temporarily) as if the
mean reversion doesn't exist.
The mechanism for the lower returns, in my view, is not going
to be some kind
of sustained
mean -
reversion to old - school valuations, as the more bearishly inclined would predict.
This
reversion to the
mean can occur one
of two ways (or a combination
of both!)
I give Grantham credit for coming
to this realization (something he has done before) but I wonder how his investors feel about it after years
of playing the
mean reversion waiting game.
Because
of a rougher - looking schedule than in years (I
mean, who really knows until halfway through the season — it was a big surprise
to most that the AFCW wasn't tougher in 2017 for instance, or that the NYG would suck so epically), and no Shazier, and general
reversion to the
mean, and no particular reason
to think Ben will be available for every game... I'll say 10 -5-1 with losses @ Tampa, @ Cin, Carolina, @ Denver, LAC.
In the case
of YouGov, this is actually within the normal range
of their recent polling (they had the Tory lead at 7 and 8 points in August too) and the MORI poll is probably at least partially a
reversion to the
mean after an anomalously high 45 % score for the Tories their previous poll.
The title has a sly double
meaning, referring both
to protagonist Léo's penchant for getting horizontal with nearly every person he encounters while tooling around the French countryside, seeking inspiration for a screenplay he never quite gets around
to writing, and
to the inherent difficulty
of just being human, which Guiraudie imagines as a constant battle against
reversion to an animal state.
With respect
to students and test scores,
reversion to the
mean suggests that students with scores in the upper or lower tail
of the test - score distribution are likely
to perform closer
to the average when tested more than once.
Why does the prospect
of Reversion compromise Meyer and Berko's ability
to solve their outstanding cases, and what does that possibility
mean to both
of them?
I continue
to believe that rates will have
to go up (e.g.
reversion to the
mean, reduce the «real» value
of $ 20T in US debt, expiration
of «conspiracy theory» suggesting the Fed held rates on the floor until the election
to get Hillary elected, etc, etc)....
I believe # 5, incidentally, from your point
of view, though I don't think I could call the erosion
of competitive advantages
of certain companies
to be
mean reversion, if and when it occurs.
What is more interesting is that the
reversion happens a little faster, at a rate
of 28.2 % / month, which
means absent other disturbances, it closes half
of the gap
to the
mean reversion target over 44 days.
Given the strength
of the
mean reversion effect in volatility, for the VIX
to stay elevated for a long period
of time requires a series
of crises akin
to what we had in 1998 - 2002.
Montier contended that proponents
of the new normal also misunderstand fat tails, which are nothing new and which «create fat pitches» — the opportunities that investors seek
to exploit through
mean reversion strategies.
It's a matter
of time that the fund either faces
mean reversion or opens itself
to the entire market cap.
He credits much
of the success
of the «formula» for this but attributes it
to «
reversion to the
mean».
I trace my awakening
to the dangers
of mean reversion to the 2008 crisis but I believe that the signs
of structural change were around me for at least a decade prior.
Whether you are leaning towards a style
of value investing focused on
reversion to the
mean or the one focused on finding underappreciated compounders
of capital, you will need
to be able
to understand what the future economics
of the underlying business are likely
to be.
The types
of structural changes that can cause distribution
to go awry range the spectrum, and the following is a list, albeit not comprehensive,
of why these changes in the context
of mean reversion over time.
The process
of mean reversion is built on the presumption that the underlying distribution (whether it be a time series or cross sectional) is stationary and that while there may be big swings from year
to year (or from company
to company), the numbers revert back
to a norm.
For
mean reversion, the two best rankings I have found are 100 - day Historical Volatility (ranking from high
to low) and Rate
of Return (3,5,7 day) ranking from most sold off
to least.
From years
of research, this has been a good indicator use
to measure short term
mean reversion.
The strategeis are
mean reversion, trend following and breakouts with average holds
of a few days
to a few months.
This trend matters
to investors because rising valuation levels inflate past performance, reduce potential future performance, and amplify the risk
of mean reversion to historical valuations.
You must train yourself
to follow your system's rules no matter what and remember that the strength
of a
mean reversion system is the high probability thatmarkets will stay in a range.
Given the volatility
of this income, this is a low value driver
of NIM and should be looked at in a historical context when projecting into forward periods due
to the likelihood
of mean reversion.
In general for
mean reversion adding any kind
of stop seems
to make the numbers worse.
Apparently your results reflect the strong uptrend
of the market and can not be used
to support
mean reversion unless the series are properly detrended.