Definition
For the Shiller P/E, the earnings of the past 10 years are inflation-adjusted and averaged. The result is used for P/E calculation. Since it looks at the average over the last 10 years, the Shiller P/E is also called PE10.
The Shiller P/E was first used by professor Robert Shiller to measure
the valuation of the overall market. The same calculation is applied here to individual companies.
Explanation
Compared with the regular P/E ratio, which works poorly for cyclical businesses, the Shiller P/E smoothed out the fluctuations of profit margins during business cycles. Therefore it is more accurate in reflecting the valuation of the company.
If a company has consistent business performance, the Shiller P/E should give similar results to regular P/E.
Compared with the P/S ratio, the Shiller P/E makes the comparison between different industries more meaningful.
Beaware
The Shiller P/E assumes that over the long term, businesses and profitability revert to their means. If a companys business model does not work in the future compared with the past, the Shiller P/E and P/S ratio will give false valuations.
Related Terms
P/B Ratio,
P/E Ratio,
P/S Ratio,
Price-to-Free-Cash-Flow ratio,
E10* All numbers are in millions except for per share dataHewlett-Packard Co Annual Data
| Oct03 | Oct04 | Oct05 | Oct06 | Oct07 | Oct08 | Oct09 | Oct10 | Oct11 | Oct12 |
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| ShillerPE |  | | | | | | | | | |
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Hewlett-Packard Co Quarterly Data
| Oct10 | Jan11 | Apr11 | Jul11 | Oct11 | Jan12 | Apr12 | Jul12 | Oct12 | Jan13 |
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| ShillerPE | | | | | | | | | | |
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European Shorting
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