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If the data is biased or has holes in it, you will end up with a biased system.

INTRODUCTION

The whole point of back-testing is to simulate the live trading environment as closely as possible so you can find a persistent, profitable edge. The problem is that financial data is not stationary. A back-test by itself does not do a great job of imitating the ever-changing nature of markets. A better solution is to use walk-forward analysis where you run the system over a small segment of data and then move forward into a segment of out-of-sample data repeatedly.

This better mimics the actual process you would experience moving from back-testing to live trading. Since financial markets are very efficient, the success of a trading system can rest on a very thin margin. High frequency trading models require lower transaction costs than slower models. So try to find a way to reduce your trading costs. For example, by using a different broker, using different order types or trading at different times.

Another question to ask is whether you are modelling transaction costs correctly in your back-test. Your trading system may be improved by more accurate values. Sometimes a trading system fails not because it is mediocre but because it is not being executed correctly. This may be due to difficulties involved in execution. By automating a trading system you can remove human error and execute trades far more accurately.

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This article shows the steps to automating a trading system in Excel. Too much optimisation of a trading system can be dangerous because it can lead to curve fitting very quickly. This is true if you are searching hundreds of trading parameters for the holy grail system. However, optimisation has a very important use for observing the robustness of trading parameters.

To test for robustness you simply need to look at the system performance of neighbouring parameters. For example, if your trading system works well with a 20 period moving average, it should also perform well with an 18, 19, 21, 22 period moving average. Thus, optimising can help you to find more robust settings for your trading system.

As I detailed in another article, combining trading systems together is one of the easiest and best ways to improve a single trading system. If two trading systems are not correlated, combining them together usually leads to smaller drawdowns and therefore better risk-adjusted returns. A problem with your trading system might be that it is too static. Financial data is dynamic and ever changing so the best system is one that stays in tune with the market. Walk-forward analysis, optimisation, and machine learning are ways to re-tune the system to current market conditions.

Are there any other ways you could make your system more reactive?


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Even a profitable trading system will blow up if you bet too much on every trade. As I wrote in a previous article, the Kelly formula provides a mathematical answer to calculating the best trade size. Filters, in general, are mechanisms designed to remove unwanted or unnecessary components. This can be applied to trading system design as well, however, this must be done carefully so as not to introduce curve fitting or data mining bias.

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Examples of filters might include intermarket analysis or regime filters — such as trading only during certain market conditions like bull markets or bear markets or phases of volatility. Filters might also include economic measures like inflation or unemployment or composite indicators made up of many different factors or indicators combined. Along similar lines, a trading system might be improved by introducing fundamental data. In stocks, fundamental data may include PE ratios, earnings per share, free cash flow or insider transactions.

For an investing model that utilises fundamental data in this way see the Marwood Value Model.

The Ultimate Forex Dynamic System and Indicators

However, outdated, overly simplistic rules may be the reason why a trading system stops working. Sophisticated ideas beyond the realms of most ordinary investors may therefore be the answer to finding a profitable edge. If your trading system uses profit targets it may miss out on a potentially big payout during a long tail or black swan type of event.

Thus, your profit targets might be reducing the profit potential of your strategy. If not, they can tie you in knots. Recognition of the idea that what a market is doing, particularly in a time frame higher than the one in which you normally execute, can have a huge impact on whether or not an indicator makes any sense.

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  5. Learn how your comment data is processed. Last updated on July 2nd, Technical indicators are part and parcel of the world of trading and are here to stay. What About Price Action? Price risk versus information risk The whole point of understanding price risk versus information risk is that timing is crucial. Great Signals.

    Bad Price Level. Increase your context time frame Upping your context time frame not your execution chart to match bigger players can really help you to find some excellent opportunities. Dynamic Zone based trading systems can actually quantify the extremes and thereby improve the trading process. And most importantly these trading improvements can be used to increase the profit potential in any market. Dynamic Zones offer a solution to the problem of fixed buy and sell zones for any indicator driven systems.

    McGinley Dynamic Indicator: Better Than A Moving Average? (Trading Strategy)

    Dynamic Zones offer traders a different perspective on the typical trading systems. The markets are constantly changing, and if indicator driven trading systems are to remain competitive, they must learn to evolve with the markets.

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