If you have returns on a security and also on the market,you can estimate beta using

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Regression analysis is the best choice for estimating beta when there are returns on both the security and the market. Beta is a measure of a security's volatility relative to the market, and it can be estimated by regressing the returns of the security against the returns of the market using a linear regression model. The slope of the regression line is equal to beta, which represents the amount of systematic risk that the security has relative to the market. Other models such as the CAPM and dividend discount models do not directly estimate beta and may be less accurate in cases where there are multiple sources of returns.

If You Have Returns on a Security and Also on the Market,you