By analyzing the price-to-earnings ratio, investors can evaluate a company's shares within the context of actual income the company has generated over a certain period. (investment.suite101.com)

A measure of the price-to-earnings ratio (P/E) using forecasted earnings for the P/E calculation. While the earnings used are just an estimate and are not as reliable as current earnings data, there is still benefit in estimated P/E analysis. (answers.com)

Graham sets the magic number of <15 as an ideal price to earnings ratio. I would argue that this number is a guide. Some sectors have ridiculously low P/E ratios, others have ridiculously high ratios. It is worthwhile to have a look at sector numbers before getting too excited about a company. (traderplanet.com)