Instruct: Classify Amazon reviews into positive or negative sentiment
Query: lacks science

This book is seamingly orginised and comprehensive. It tries to touch on various techniques that have been in use. It falls short in many aspects, however. First, it does not give a clear understanding of which method is best under what conditions. Second, there are no tests or reports of tests from other literature (except one or two), so the reader is not able to make performance comparison. The reader ends up with a knowledge of several techniques at a high level but with a lot of confusion as to when and how to use these methods. Third, arguments used in general are not scientific; gut feeling, or long years of experience is one thing, scientific evidence is another. Overall, the book clearly shows that the authors lack adequate quantitative skills in technical analysis and this does not make their critisism about "system testing" very credible. It is an inexpensive book, but buying a better book at a slightly higher price should be a better investment.