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

What time period is used by yahoo finance to calculate beta
Citing the Yahoo Finance Help page, Beta: The Beta used is Beta of Equity. Beta is the monthly price   change of a particular company relative to the monthly price change of   the S&P500. The time period for Beta is 3 years (36 months) when   available. Regarding customised time periods, I do not think so.