Trading System Back Testing! Know These Shocking Limitations
A trading system might consist of a few indicators and a number of rules that tell when to enter the trade and when to exit the trade. Trading system is considered to be proven and tested if there is some date that supports its performance under live market trading conditions. However, it might not be possible to test a trading system quickly under live trading conditions. To overcome such problems, backtesting has been developed. Backtesting is done with the use of a software.
How to do backtesting? Using a backtesting software makes it very simple and easy. Backtesting uses historical data to test the performance of the trading system under the past market conditions.
There are many problems with historical data. There is no slippage in backtesting. Slippage is one of the most important problem that a trader faces while trading live. The other problem that the backtest ignores is the widening of spreads under volatile market conditions. So backtesting results are no guarantee that the trading system will perform well under live market conditions. Things that worked in the past might not work now. Similarly something that didn’t work in the past, may work now! You never know!
In other words, no two trades work out in exact the same way twice. SO you have to be careful when looking at the back testing results and take it with a pinch of salt. However, there are still some advantages of back testing a trading system.
Back testing can give you a feel how a particular market behaves under certain conditions. Back testing can also spot you certain general characteristics of the market like the seasonal trends and market tendencies.
On the other hand, you might not find much seasonal trends in the currencies and bond market. Some though talk of the January Effect but this effect is not that pronounced now a days. In case of stocks, stock prices tend to rise at the end of each month and the first few days of each new month as institutional investors tend to put new money to work during that time frame.
US Dollar Index trendlines might last for months to years. In other markets too backtesting can help you figure out important trends that lasts for last times. Backtesting can help you figure out how long a trend might last in a particular market.
Now when you back test your trading system and the set of indicators, you can check their accuracy. For example, if you using a trading system based on moving average crossovers, you can back test it using different combinations. Then monitor each combination under live conditions to see which works the best.
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