Instruct: Classify Amazon reviews into positive or negative sentiment
Query: few mistakes in 7th Ed., but no better for it ...

I haven't noticed the mistakes the other reviewers have mentioned; perhaps they reviewed an earlier edition, or I haven't gotten far enough (through ch. 8). Anyway, the book is awful purely on account of the author's inability to make the concepts clear, and to use terminology precisely -- perhaps this fog is masking the errors. Fwiw, others in my class agree. Also, the index is uselessly short, so if you don't remember the meaning of some term defined in the text, you'll have to hunt for the imprecise definition page by page. In sum: unclear and difficult to use. Seek another alternative if at all possible.