Book Review: Evidence-Based Technical Analysis by David Aronson
There is one book that should be a part of obligatory reading at the start of every Forex trader's career —
It was written by David Aronson, a professor of finance in the Zicklin School of Business at the time of writing the book. He also manages a website called Evidence Based Technical Analysis (not updated since 2009). Currently he is the president of the Hood River Research company.
The main point of the book is the supremacy of what the author calls objective technical analysis over subjective technical analysis. It is discussed and proven in the first part of the book. The second part is dedicated to a case study of testing objective TA rules using objective TA criteria.
The following ideas are expressed in
- Subjective TA rules cannot be properly tested, and their efficiency cannot be measured.
- Objective TA rules can be tested and researched using scientific methods.
- Human history proves that scientific methods bring superior results compared to other methods.
- A set of psychological biases is working against traders when they fail to implement rigorous objective methods in their rule development and execution.
- Despite markets being probabilistic in their nature, it is possible to scientifically test various trading rules and make correct conclusions regarding their efficiency.
- Statistical analysis and confidence intervals should be used to explore and describe viability of TA rules.
- Data mining (backtesting) is probably the best tool in the hands of an objective TA practitioner.
- Even though data mining is prone to data mining bias, it can be accounted for using certain statistical methods.
- The role of a technical analyst is not to produce the
end-product(analysis, signals), but to create ideas, which are to be tested and executed by automated systems. Otherwise, analysts will always be prone to falling back to the inferior subjective TA methods.
Apart from a purely speculative and educational part of the book, there is a complete case study of testing more than six thousand trading strategies on S&P500 index futures. The case study is basically a backtest of so many rules on a
Because the case study aims to select the best trading strategy of several thousands, it is clearly a data mining endeavor and thus prone to data mining bias. The author uses improved White's Reality Check and
It won't be a huge spoiler to tell you that no such strategies were found among the tested ones. There were profitable backtest results (the best rule with more than 10% annualized return), but in all cases, such a result was due to data mining bias and had no statistical significance (
That does not mean that the experiment was useless or that there is no point in reading about it. On the contrary — it is probably the most enlightening and inspirational experience you will have if you have never practiced true objective TA before.
If the pros of the
- The biggest advantage is the introduction of objective TA concept. Of course, I cannot say that no one except David Aronson does that, but for many traders, it is this book that can present this important topic.
- A very gradual approach to introduction of the scientific methods into trading. It is a very complex subject — it involves a lot of theory and explanations. David Aronson does a great job laying it all out withing boring the readers and without omitting anything important that could be crucial to understanding some of the aspects of the objective TA.
- A lot of ideas for your own TA rule development and organization of the testing process.
- Countless references to other works in the field, which allows readers not only fact check the book's statements, but also to deepen one's knowledge in the area.
- The writing style is devoid of blandness characteristic to this kind of books. This makes the book significantly easier to read.
There isn't much to talk about regarding the disadvantages of this book, but some of them have to be mentioned:
- Typos and errors. While there is nothing significant about the former, the latter is getting too far in this book (at least its Kindle version). Some of the paragraphs are swapped places, whole words are omitted, and that is in addition to a rather high complexity of the covered subject.
- It is too focused on S&P500 as the market for testing and stocks in general as the model of the market. Although it can even be an advantage if you are more of an equity trader, but for the currency traders, it is definitely a downside.
- The book was written in 2005–2006, so a lot has probably changed in the field and, unfortunately, you would need to find out about those changes from other sources. A newer edition of the
Evidence-BasedTechnical Analysis would definitely help here.
- The author fails to mention that it is very difficult to divide whole trading into two realms of objective and subjective rules. For example, it is not possible to backtest insider trading, but it definitely should have some edge.
Why read it?
The main reason to get this book and spend some 15–20 hours reading it is that it will probably change your whole concept of FX strategy creation, formulation, backtesting, and implementation. It will be most useful to those who develop their own strategies or create expert advisors for sale. On the other hand, common traders, who buy systems or subscribe to signals, will also find a lot of useful information. It will help them revise their preferences and spend time and money more wisely.
There are two categories of traders that probably will not benefit from reading
If you have any opinion, questions, or comments about
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