as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
how to calculate pe ratios for indices such as djia?
user
the official source for the dow jones p/e is dow jones.  unfortunately, the p/e is behind a pay-wall and not included in the free registration. the easiest (but only approximate) solution is to track against an equivalent etf.  here's  a list of popular indexes with an equivalent etf. source
assistant