WEB3
by BSCN
March 17, 2021
Precise and concrete data is most effective in producing high quality backtesting results, rather than involving too many data sets in the test. A combination of other trade strategies with backtesting are well worthwhile in a trader’s trading journey.
Typically, all trading attempts are for profit-making. The market is the ground on which traders deploy different strategies to profit off the markets price movements. Regardless of the approach adopted, improved profitability remains the core driver for many traders. A backtesting system is a very crucial aspect of any adopted strategy. It gives the direction of what to improve upon or what to change based on historical trading/price data.
In backtesting a strategy, traders do not need to risk real funds. It is merely a tool that traders can use when exploring new techniques or markets. Backtesting assesses the viability of a trading strategy or a pricing model by discovering how it would have played out retrospectively using historical price data.
Smart traders do not attempt using a strategy for the first time. Many subject their strategies to some tests that could prove its worth of use or not. Backtesting simulates trades and gives traders an insight into how well a strategy will work when put to live trading.
Backtesting is of two types; the manual and the automated approach. Manual backtesting involves analyzing charts and historical price data and manually placing the trades according to the strategy. On the other side, the automated system consists of using a coded program to simulate a trading strategy with all of the historical price data inputted.
The underlying premise behind the approach is to check the strategy’s viability. What worked in the past may work in the future within the same historical price range. This can be both tricky and misleading as what worked in one market may not work in another, or what worked in the past may not work in the present.
For example, a backtesting strategy could be to check the buy rate of a particular stock when it falls towards a specific percentage using historical price data.
Traders may use Google doc or spreadsheet to evaluate the performance of the strategy. The document serves as the strategy report that may include the trading platform, asset class, trading period, number of winning and losing trades, Sharpe ratio, maximum drawdown, net profit, areas in which the strategy could be improved upon, and the significance of the strategy.
Forward performance test or paper trading provides a different insight to the market opposed to backtesting. In a paper trading strategy, traders are provided with a set of live out-of-sample data to evaluate their system. Traders do not need to risk their capital, as they could only execute their trades on paper alone. Entering all data in a sheet along with the profit and loss of their system.
Backtesting shows if a strategy will perform well in the period when it’s supposed to. For example, Apple stock may rise or fall when a new release is scheduled or announced. The backtesting strategy shows if such activities have a price history, how effective, the percentage in the rise or decline of the price whenever such events are announced or scheduled.
Backtesting will provide an understanding of how the strategy performs in different markets. Backtesting in various markets will give a much better insight into a strategy than using only one market type.
Improving the strategy as per the result obtained from backtesting the system involves tweaking the strategy to fit into his profit objective. This creates a potential problem for the trader as he continues to make changes to suit his goal. The result may mean that the strategy may not be profitable in a real live trade.
Many traders do not take into account the bias of their strategy when they continuously make changes. The result will be that the strategy may mostly fail in a real live trading environment. For backtesting to work, traders must learn to develop their strategies and test them in good faith, avoiding bias as much as possible. A strategy should be developed without relying on data and biases in the backtesting strategy.
Testing a wide range of hypothetical strategies against the same data set is more likely to fail in live trading because of too many invalid strategies. This could beat the market over some time when back teste properly. This is called data dredging.
Alternatively, to compensate for the tendencies to cherry-pick or get involved in data dredging, traders can use a strategy that works in relevant, in-samples and periods and backtest with data from different relevant and out-of-sample periods. If the two events obtained the same result or something close, then the strategy is valid.
Cherry-picking based on traders’ bias and data dredging should be avoided by traders at all costs. These pitfalls will declare their backtesting strategy invalid in a real live trading environment. Precise and concrete data is most effective in producing high quality backtesting results, rather than involving too many data sets in the test.
Backtesting results may be tricky because it is easy to imprint your ideas. Therefore backtesting alone won’t guarantee a 100% profitable trading experience. A combination of other trade strategies with backtesting are well worthwhile in a trader’s trading journey.
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