Definition of ‘Beta’
Definition: Beta is a numeric value that measures the fluctuations of a stock to changes in the overall stock market.
Description: Beta measures the responsiveness of a stock’s price to changes in the overall stock market. On comparison of the benchmark index for e.g. NSE Nifty to a particular stock returns, a pattern develops that shows the stock’s openness to the market risk. This helps the investor to decide whether he wants to go for the riskier stock that is highly correlated with the market (beta above 1), or with a less volatile one (beta below 1).
For example. if a stock’s beta value is 1.3, it means, theoretically this stock is 30% more volatile than the market. Beta calculation is done by regression analysis which shows security’s response with that of the market.
By multiplying the beta value of a stock with the expected movement of an index, the expected change in the value of the stock can be determined. For example. if beta is 1.3 and the market is expected to move up by 10%, then the stock should move up by 13% (1.3 x 10) .
Beta is the key factor used in the Capital Asset Price Model (CAPM) which is a model that measures the return of a stock. The volatility of the stock and systematic risk can be judged by calculating beta. A positive beta value indicates that stocks generally move in the same direction with that of the market and the vice versa.
Also see: volatility, CAPM, NSE Nifty, alpha.
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