I read this (1st post and other subsequent ones I glanced through) and the data is incorrect. That’s because this NSE source gives you standalone PE ratios and related measures. That’s incorrect because you need consolidated earnings to know how much your stock has made for you.
There is really no free source I know that gives you consolidated earnings of Nifty. I compute it for my analysis and am attaching it here (unformatted so apologies in advance). It shows that as of 25 August (and Nifty hasn’t moved much since) the trailing PE is 19.43. NiftyQ1FY16.xlsx (21.9 KB)
Over the years as firms have expanded the gap between standalone and consolidated earnings have widened. I wrote about it in alphaideas here - A company should be known by the companies it keeps. So looking at standalone earnings may be deceptive.