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Comparing current PE to mean PE can allow you to see if T-Mobile US Inc may be undervalued based on PE ratio.

* Total of 894 data points since 04/22/2007.

** From 04/22/2007 we changed 13 data points that were under -50 PE to -50 and 115 data points that were over 100 to 100. This helps smooth edge cases where companies had extreme PE ratios during certain periods. Removing these data points completely caused new issues with certain companies.