Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not helpful

I found this book too brief on both methodology, worked examples and samples problems. Recommend looking elsewhere for your GRE materials. This is the 2nd edition new for 2001, and, by the way, the first edition of the book (ISBN: 0028612612) is poorly rated as well. I guess it didn't get much work between editions. Found Cracking the GRE 2002 considerably better. Good luck!