Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It's the best guarantee that you will hate Statistics that money can buy.

I would say that this book is poorly written, except that saying that it was written at all gives it too much credit. Almost no writing was done for this book; it's more accurate to say that the book was "compiled" out of a stack of example problems.The author seems to have taken the idea that, "Students don't ever really read textbooks" to heart and crafted a book that simply cannot be read. The best you can do is browse through it, looking for examples that match what you're trying to do and studying them. His sample solutions are detailed, but they make little attempt to teach the intuition behind why certain steps are chosen. Nor can that intuition be learned from the main text of the chapter, as there is wretchedly little of it.A horrible book; bad even by the low standards that math textbooks are generally held to.