Beta is the a calculation that measures the relative volatility of a stock in correlation to a particular standard. For U.S. stocks that standard is usually, but not always, the S&P 500. Beta is a form of regression analysis and it can be useful for investors regardless of their risk tolerance. Beta is considered one of the few data points that can be beneficial for practitioners of both fundamental analysis and technical analysis. This page lists stocks that have unusually low beta calculations, meaning there is little correlation between the price moves of these stocks and the S&P 500.
