Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dull but tries hard

This book achieves what it aims to do. It gives an overview of some of Gann's ideas and explains his 50% retracement rule in almost painful detail.I understand the frustration of the previous two reviewers. The book is poorly edited and full of typographical errors. Because it contains a lot of detailed workings, there is a tendency for the eye to skip over that detail. I can imagine that is exactly what the editor's eye did. Hence the typos.This book is not worthless though. It contains some sound advice about the importance of employing systematic analysis and the disciplined use of stops. It also provides a simple but reasonably effective trading technique. On the other hand, it is dull and too long. The general technique is also covered more succinctly and interestingly in other trading books.It is not worth the "new" price but a cheap secondhand copy or, even better, a loaner might be worth the effort