I think the data published by NSE is based standalone and yearend results but I haven’t seen their actual methodology so my understanding could be wrong.
@diffsoft does a great job of meticulously calculating Nifty PE based on TTM consolidated profits which is the correct method of calculating PE ratio. As per his calculations (available here) Nifty PE as of Aug 14 was 22.83. Nifty on Aug 14 was trading at 9794. Nifty 50 EPS as of Aug 14 works out be 9794/22.83 = 429. Assuming a 3% sequential growth in EPS, Nifty 50 EPS as of today is approximately 440. Nifty 50 is trading at 10334 so based on this calculation, Nifty 50 PE as of today (Oct 31 2017) works out to be 10334/440 = 23.5 against a published number of 26.77.
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