Particular attention is paid to companies with P/E ratios substantially higher or lower than the peer group. A P/E far below the average can mean (among other reasons) that the true value of a company has not been identified by the market, that the business model is flawed, or that the most recent profits include, for example, substantial one-off items. Companies with P/E ratios substantially different from the peers (the outliers) can be removed or other corrective measures used to avoid this problem.