Widely Different P/E Calculations for ETFs

[Laxputs]

Look up the p/e of an ETF across different investing sites and you will get different results. Some sites exclude negative earnings. Some sites include fully diluted share count. Some sites average the p/e; some sites weight the average of the p/e. There are articles written on this inconsistency problem.

 

Seems to me the most accurate and reliable would be taking the earnings of all the companies in the index and divide that by the market cap. Which site does that? Does RBC Direct Investing analysis page do that?

 

Thanks.