Back Testing Your Trading System-Know These Shocking Limitations
Your trading system needs thorough testing before you decide to trade live with it. A trading system might comprise of a set of indicators. You need to know how well your trading system and its set of indicators work in a particular market.
For this you can do back testing. Back testing is a method that uses historical data to test how well your indicators work in a particular market. You can use back testing software that enables you to look at the past market data and test how well the indicators and your trading system have worked in the past market.
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!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.
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.
Some markets are highly seasonal. For example, if you are a commodity trader and tend to trade agricultural commodities like the grain, seed or the livestock, these have a fixed planting and harvesting cycles.
For example, some markets especially the commodities market is highly seasonal and cyclical in nature. Now in other markets, you might not find any seasonal trends. For example, there is very little seasonality in curreny market or the bond market. In case of the stock market, there is much talk of the January Effect. Well, it is there no doubt about it. Some years, it is highly pronounced and others it is not that pronounced. Similarly stock prices tend to rise at the end of each month and the first few days of the new months. The reason for this is that many institutional investors tend to put the new funds to work at the end of the month and the beginning of the new month!
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.
But to tell you the truth, backtesting can only give you a rough guess about the performance of the trading system under live trading conditions. There is no substitute for live trading results!
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