Offer your thoughts or opinion on the input financial query or topic using your financial background.

How to calculate PE ratios for indices such as DJIA?
You could look up the P/E of an equivalent ETF, or break the ETF into components and look those up. Each index has its own methodology, usually weighted by market cap.  See here: http://www.amex.com/etf/prodInf/EtAllhold.jsp?Product_Symbol=DIA