When analyzing publicly traded stocks, there are numerous methodologies that can be used to valuate them, but one of the most common and...

An introduction on the P/E ratio, the benefits and pitfalls of the trailing and forward P/E ratios, and when and when not to use them. 

A look at why price-to-earnings ratios (P/E) can be different across data providers and why some would use trailing P/E ratios.