|

Introduction
to Market Timing
Stock
Market Timing
What
is Market Timing?
Market
timing is simply the act of selling a portion of your stock market positions
to a risk-free interest bearing account when odds favor a significant
stock market decline. There are very few advisors that do not use some
degree of market timing.
- Individuals
use timing. Most just don't realize it. Every investment has to
be bought at some point and sold at some point. The so-called "buy-and-hold"
investors end up using a very bad timing strategy based purely on
emotions.
- Mutual funds
may hold 10-15% cash positions sometimes. But they can't risk under
performing their competitors by being only partially invested. (They
would rather lose money for their clients if everybody else were losing
money, than under perform in a bull market.)
- Conservative
advisors recommend stock positions of 0% to 100% based on their
market perceptions.
- Aggressive
advisors will recommend positions from 100% short to 200% long
using margin.
Timing
has some huge advantages.
- It's easier
to accept small losses. Taking periodic small losses will not
cause you to give up on the stock market. On the other hand, a 35%
drawdown on your account will definitely have you doubting your strategy.
- Much of the
time you are invested in risk-free cash. Your money is
safely earning interest and you get a break from market induced anxiety.
- You have a
strategy. Without a strategy, you'll always be thinking, "Shouldn't
I educate myself and get a strategy?" This question will especially
haunt you when the market has turned against you. The temptation to
sell everything until you HAVE a strategy will be enormous and irresistible.
- Performance.
Many timing strategies have outperformed buy-and-hold.
- Sophistication.
The education you receive from developing a market timing strategy
is valuable. It will pay off sometime down the road even if it temporarily
isn't working out as well as you'd like.
Random
Timing Methods Do Not Work.
Most
investors use random timing methods. To make their timing decisions they
use
- Hot tips.
- Random advice
from magazines or TV.
- Conflicting expert
advice.
- Emotion and
greed.
This
is the type of timing that never works over the long term and gives market
timing a bad name. It's driven by emotion and greed and always results
in buying high and selling low.
The analysts
on TV and Magazines may very well know what they are talking about. But,
analysts can change their opinions quickly. For example, you see a well
respected expert on CNBC say that he see the market going much higher
for the rest of the year. So, you feel confident about your existing positions
and may even add to them. However, after a couple of weeks this advisor
could easily reverse his opinion. You'd probably never even know. Your
emotions will force you to follow another bullish advisor's opinion, as
you desperately want the market to go higher. Following this type of random
advice is a very bad strategy.
Unproven
Timing Methods Rarely Work.
Using
unproven methods for market timing is a close relative to random timing
methods.
- Investment books
are full of unproven timing methods that completely fall apart when
actually tested against historical data.
- Don't trust
a theory or method unless you have proof that it actually works over
a significant period of time.
- Developing theories
or methods that are profitable over a few years time are very easy
to construct. But take that theory and run it against historical data
from the '70s and many will fail miserably.
Mechanical
Timing Methods
Mechanical
timing means that you develop a strategy for timing purchases and sales
of investments that does not require any type of expert analysis. A mechanical
timing system simply generates buy and sell signals that you follow without
question. Mechanical timing methods can be backtested against historical
data to ensure that they are historically profitable. Of course this is
no guarantee of future performance.
These
are the types of timing systems that are contained in ULTRA products.
If a timing theory can't be represented in some mathematical form that
can be back-tested by a computer, there's really no way to know if it
is REALLY historically profitable. For example, you could use a stack
of historical charts to test manually drawn trendlines, but no matter
how hard you try to avoid it; the results will be skewed based on what
you know about historical market action.
Expert
Timing Methods
An expert
makes decisions based on everything that he knows. As you can probably
imagine becoming an expert is very difficult. An expert can do very well
timing the market versus a mechanical method because:
- There are certain
types of analysis that are very difficult to represent in computerized
timing models such as support / resistance, trendlines, chart patterns,
and news.
- Computers also
have trouble weighing all the different types of analysis and coming
up with a composite decision.
- Experts can weigh
all the evidence, come up with a plan with contingencies if things
don't go right. This is very difficult for computers.
- Experts can
change their methods and strategies. Computers are stuck with their
strategies once they are programmed and released.
Many
experts utilize mechanical timing methods to help them make decisions.
They will then sometimes override the mechanical methods based on knowledge
that can't be represented with computer modeling.
Experts
will also often allow mechanical methods to manage part of their capital
thereby taking pressure off themselves to make good decisions with their
entire nestegg. It is very comforting to know watch your mechanical systems
make money while you are bearish on the market and can't find a good reason
to safely take positions with your discretionary capital.
"Same
Day" Versus "Next Day" Trading
This
is a very important concept.
Mechanical
timing methods operate on stock market closing data. This data is only
available AFTER the market closes. You can't act on buy or sell signal
based on this data until the next trading day. With mutual funds, when
you purchase you get the closing price of the fund at end of the NEXT
market close.
Most
stock market timing advocates tabulate their historical results assuming
that they can get the closing price on the SAME DAY as the buy or sell
signal occurs. We call this SAME DAY trading. Tabulating results based
on SAME DAY trading is usually misleading.
In some
cases, SAME DAY trading can be approximated by using PRE-CLOSE stock market
statistics. For example, at Rydex Mutual Funds you have until 2:45 PM
CST to enter your trade to get the price at the end of that day. It is
possible to use 2:40 PM CST stock market data and then enter your trade
before the 2:45 PM deadline thereby approximating SAME-DAY trading..
NEXT
DAY trading means that you use the actual closing stock market statistics
to generate your buy and sell signals. Then, you just casually enter your
trade sometime before the market closes the next day.
Here's
some advice gained from years of testing and experience:
- If your model
trades infrequently (less than 3-4 times a year) there isn't any advantage
to SAME DAY trading. Especially not when considering the extra commitment
involved.
- Timing Systems
that trade very frequently can be extremely profitable on a SAME DAY
theoretical basis, but performance drops off significantly with NEXT
DAY trading.
- PRE-CLOSE breadth
statistics such as NYSE Advances and Declines are much closer to the
actual closing numbers than price such as the S&P 500. The S&P 500
can move drastically in just a few minutes but breadth statistics
change very slowly.
Market
Timing Pitfalls
You need
to be careful when deciding on a market timing strategy, as there are
many pitfalls. Here are some that you should be sure to understand.
- Even excellent
systems go through periods where they under perform the market. It's
a fact. If you expect to beat the market every single month of the
year using timing, get ready for disappointment. Outperforming the
market on a quarterly or yearly basis is much more realistic. Here's
a very common example, a system stays invested during an 8% drop of
about two weeks. Just as an inexperienced user will give up on the
system and sell out, the market turns and rallies 25%. Or, a system
misses an important bottom and the market rallies 8%. Has this system
stopped working? Who knows? Many different scenarios could emerge.
This could be a bear market rally. Or, the system may enter later
just before a more important market rise. And so on. The bottom line
is to be slow to pick systems and equally slow to give up on them.
- Some systems
are just theories and never worked. In years of designing and testing
systems, I'm amazed at the large number that do not work when tested.
Some common indicators and systems are of absolutely no value whatsoever.
A good rule of thumb is to assume that an indicator or system is worthless
unless you have proof otherwise.
- Depending too
heavily on a single timing system. Timing systems are not perfect.
Sometimes they temporarily under-perform the market. Some simply stop
working. This is why it is imperative that you do not rely too heavily
on a single system. Instead, you should pick a number of good systems
and devise a strategy based on the set of systems that move you incrementally
in and out of the market.
- Assuming the
"best" system is the one that has the highest historical return. Your
search should be for the system that has, "The best probability of
performing well in real-time within your risk comfort zone.." The
"Best" system also depends on the individual, SAME DAY vs. NEXT DAY,
Frequency of trades, etc.
- Assuming a system
that performs well with SAME DAY trading will also perform well with
NEXT DAY trading.
- Curve Fitting.
This is adding complexity to a system in order to produce better and
better historical results. For example, A simple system that is profitable
but only 60% of its trades are winners. You notice that many of the
"bad" signals occur near the beginning of the month so you filter
those out by adding complexity that brings your accuracy to 70%. As
you add complexity you can continue to improve your historical record
to 90% accurate. However, the complicated system is much less likely
to reproduce the 90% accuracy than the simple system was to reproduce
the 60% accuracy.
- Optimizing over
an entire set of data. Timing systems should be developed using a
period of data and then tested over an out-of-sample period to get
a pseudo-real-time test of the system.
- Testing a system
over too short a historical period. It is very easy to design systems
that perform well over short periods in history. However, most will
fall apart in out-of-sample periods and in real-time. The longer a
system performs successfully in historical-testing the greater the
odds of real-time success.
Out
Of Sample Testing
During
proper construction of a timing system, not all of the historical data
is used during the construction process. Some of the historical data is
reserved for testing the system in a pseudo-real-time test called out-of-sample
testing. Out of sample testing is important to insure against excessive
curve fitting.
For
example, assuming you have 55 years of historical data, you may reserve
the oldest and newest 10 years of data for an out-of-sample test of the
completed system. The only problem with this method is that you may have
personal knowledge of the latest 10 years and you may use it in the construction
process without realizing it.
You can
avoid this possibility by using the latest 15 years of data to construct
the system and then use the earlier 40 years to run an out-of-sample test.
This allows you to construct your system based on recent market action
and use the earlier data to make sure the system doesn't bankrupt itself
in a long out-of-sample test during different market conditions.
In any
case, the longer the out-of-sample test, the better. Be wary of any system
that is not tested against out-of-sample data.
The
Biggest Pitfall of all, Unrealistic Expectations
If you
learn one thing from this tutorial let it be this:
"Whatever
annual gain you are seeking with a strategy, you will almost certainly
experience an equal drawdown in real-time."
Think
about what this means:
- All those advertised
promises of 200% gains per year are lies. There are no exceptions. At
a 200% annual rate it doesn't take long before you will own all the
wealth on the earth.
- If you are trading
a high-risk leveraged strategy that has historically returned 100% annually,
then you will probably eventually take a 100% drawdown (I.e. go broke).
This almost always happens with futures trading strategies. Of course
the crooked strategy vendor can simply re-optimize and sell more $3,000
strategies to another group of suckers
- The most talented
investors in the world average 30-40% returns per year. If you have
this skill then you can start a hedge fund and make millions annually
in fees. However, your chance of being that skilled is about the same
as playing pro baseball.
Having
said all that,
Can
one substantially beat the market with far less risk? DEFINITELY.
The market historically returns about 9% and often takes 40% drawdowns.
That is what you'll eventually achieve if you stick with buy/hold over
the long term.
However,
it's my opinion that anybody armed with a good strategy can earn 15% annually
from the stock market while keeping periodic drawdowns around 20%. This
is great performance and should be your realistic expectation.
And you never know, you may end up being really talented and reaching
that 30-40% annually mark.
|