Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good mechanical investing technique

Ken's book is a quick read and discloses a fairly simple mechanical stock valuation method that appears to have significantly outperformed the DJIA over the years. The in depth discussion of the history of each Dow stock is useful although somewhat boring to anyone but a real blue chip fanatic. There are two irritating limitations to the method in the book, namely there is no guidance on when to sell, i.e. when a stock becomes too overvalued and should be rotated into a new stock. The other flaw is that the 10-year average price/book is calculated incorrectly. However the method is the method and if it works, it works! Calculating the average P/B correctly merely has the effect of giving lower (more conservative) target buy prices for high growth stocks. Using this method as a screening tool for large cap value stocks is a useful investment tool to have, and keeping the above limitations in mind, the book is well worth having.