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Rocky Balboa actually never talked about investing, but while preparing for
a fight he said "It ain't how hard you can hit. It's how hard you can get hit."
Those words from a simple man are a simple explanation of part of our approach
to investment decisions for those of our clients who have completed the accumulation
stage of their financial lives, and now rely on their assets to support lifestyle.
It's not how much you can gain (or how high the income stream). It's how much
loss you can take emotionally and financially.
The time to think about your loss potential and loss tolerance is before you
invest, not after you invest, when you may face adverse price movements.
By whatever means you use to judge gain potential, make sure you also judge
loss potential, and weigh one against the other.
Generally, you should be comfortable that the potential gain substantially
exceeds the potential loss -- being mindful of the probability of gain or loss,
as well as the amount of gain or loss.
If you use trailing stop loss orders or mental stops, you can effectively
set boundaries on potential losses; but make sure that the stop loss point
is outside of the noisy volatility area. There are several tools you can use
to chose a stop loss point, some which are more readily accessible than others.
For example, among other methods, you can use prices just below apparent support
levels on the chart as possible stop levels; or you can develop stop loss points
using the historic volatility of the security, or the implied volatility in
the options pricing.
Here are some charts for several different securities using readily available
features to help set stop loss points. They show the 13-week price channels,
the 13-week rate of change, and the 13-week average true range, each of which
might be useful in helping to establish an idea of where the stop loss may
need to be to "stay in the game" without too much worry about noise knocking
you out of your position. That applies to being knocked out for a loss before
your security rises by at least as much as the stop loss amount or percentage,
but also to being knocked out after the security has risen and is on its upward
path.
With the price channels, you might consider a price just below the lower channel
as a stop loss point.
With the rate of change, you might expect that the percentage price fluctuation
in the near future could resemble the percentage price fluctuation in the recent
past, and chose to use 1.0 to 1.5 times that amount as your stop percentage.
With average true range, you might similarly expect the amount of the price
change to fluctuate in the near future in a way similar to the recent past
and use a 1.0 to 1.5 multiple of that amount as a Dollar amount of your stop.
Of course any Dollar amount stop could be expressed as a percentage stop,
or the other way around. We prefer percentage, because as the price of the
security rises the percentage approach maintains the same relationship to the
market price as when the position was opened.
An important take away from the charts below is to notice that each security
has its own particular behavior pattern, and that a single percentage for all
trades is too simplistic. It is also important to realize that the different
methods will not produce equal suggestions as to the stop loss. They are just
suggestions, not precise calculations or predictions, but considering them
is better than considering nothing. In the end, you need to use judgment about
your circumstances and the circumstances of each security to set the stop loss
parameters.
For those who say stop loss orders are not a good idea, we ask if they wish
they had some before October 2008. Even if you don't use close stops, use catastrophic
loss stops.
SPY

FXI

TLT

EWG

EWJ

BAC

FXE

GLD

Securities mentioned in this article: SPY, FXI, TLT, EWG, EWJ, BAC, FXE, GLD
Disclosure: We own some, but not all securities mentioned in this article.
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