Pick any stock and estimate its value based on at least two competitors PE ratios. Use the companies forward P/E ratios, which can be found on the companys Yahoo Finance page under the Statistics tab. Use analyst average EPS estimates for next year as an estimate of your companys future EPS. These can be found under the Analysts tab on Yahoo Finance. Unfortunately, Yahoo Finance no longer provides analysis of firm competitors, but if you have trouble finding some, Google Finance provides a nice tool for this under Related companies on the companys main stock page. Compare Walmart (WMT) to Target (TGT) and Costco (COST).