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As of today, Rio Tinto PLC's current share price is $33.08. Rio Tinto PLC's E10 for the quarter that ended in Jun. 2015 was $3.39. Rio Tinto PLC's Shiller P/E Ratio for today is 9.76.
During the past 13 years, Rio Tinto PLC's highest Shiller P/E Ratio was 42.65. The lowest was 5.94. And the median was 17.63.
E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller P/E calculation. E10 is the average of the inflation adjusted earnings of a company over the past 10 years.
Rio Tinto PLC's adjusted earnings per share data of for the fiscal year that ended in Dec14 was $3.512. Add all the adjusted EPS for the past 10 years together and divide 10 will get our E10, which is $3.39 for the trailing ten years ended in Dec14.
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.
Rio Tinto PLC's Shiller P/E Ratio for today is calculated as
|Shiller P/E Ratio||=||Share Price||/||E10|
Rio Tinto PLC's E10 for the quarter that ended in Jun. 2015 is calculated as:
For example, Rio Tinto PLC's adjusted earnings per share data for the fiscal year that ended in Dec14 was:
|Adj_EPS||=||Earnigns per Share||/||CPI of Dec14 (Change)||*||Current CPI (Dec14)|
Current CPI (Dec14) = 234.812.
Rio Tinto PLC Annual Data
|per share eps||3.811||5.556||5.663||2.331||2.753||7.218||3.015||-1.6||1.973||3.512|
Add all the adjusted EPS together and divide 10 will get our E10.
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.
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.
Rio Tinto PLC Annual Data
Rio Tinto PLC Semi-Annual Data