More on parameterless trading model ~ forex trading system analysis
I have written before that my ideal trading model is one that has no parameters, and what ways there are to accomplish this. Actually, I forgot to mention that a trading strategy proposed by Dr. Andrew Lo discussed previously is in fact parameterless, and the technique is so general that it can be applied to any mean-reverting strategy.
The technique is simply this: maintain a long (or short) portfolio with capital proportional to the distance between a supposedly mean-reverting measure and its long-term mean value.
For e.g. if you are pair-trading PEP vs KO, and you believe that the spread between PEP and KO is mean-reverting, then this spread is the mean-reverting measure you should employ.
As the spread moves away from its mean, keep buying (or shorting) the spread in equal dollar amount. And as the spread reverts, keep selling (or buying) the spread in the same dollar amount. What this dollar amount should be depends on: a) the total buying power you possess, b) the expected maximum deviation of the spread from its mean, and c) how often you intend to buy/short. Note that point c is not a parameter: it is arbitrary and limited only by transaction costs, technology, and other operational issues. As for the expected maximum deviation, it can be obtained by observing the history of the spread since inception.
This scheme thus obviates the need for entry or exit thresholds, and with them, the possibility of data-snooping bias. (You may still want to impose an entry threshold based on transaction cost consideration - but that would not count as a free parameter.)
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Let me explain the basic principle how most Forex systems work. They are tuned up to work in a specific market condition. They often make money in a trending market, but loose money in a choppy market. It is not a problem as long as the market is trending and the system is making more money than it loses. Such a system can be profitable for several months and you would be happy with it. BUT...
PREPARE FOR THE WORST...
Market change over time. A well designed system starts with trend analysis to stay away from potentially losing trades. There are two problems of how a Forex system recognizes the trend.
PROBLEM: FALSE "STRONG TREND" INDICATION.
The system responds only to immediate price action. An explosive price movement that is usually the result of news release is tempting people to jump in and make a profit. It looks like a "strong trend", but what usually happens next is a hard fall.
To avoid falling into this trap, check for the SOLUTION to find a REAL trend:
==> http://www.forextrendy.com?nsjjd92834
SECOND PROBLEM: TREND RELIABILITY
Most systems use various indicators to determine the trend. Actually, there is nothing bad about using indicators. One Simply Moving Average can do the job. The problem comes with the question: "Is the market trending NOW?" Whether the market is trending or not trending is not like black and white. The correct question is: "How well the market is trending?"
And here we have something called TREND RELIABILITY.
Trends exist and they can be traded up and down for a profit. You have to focus only on the most reliable market trends. "Forex Trendy" is a software solution to find the BEST trending currency pairs, time frames and compute the trend reliability for each Forex chart:
==> http://www.forextrendy.com?nsjjd92834
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