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Being a google finance user myself I was not able t figure out how it computes the beta. However, my best guess it's that is done in a way very similar to those of Yahoo and Bloomberg. I.e. SP500 and 36 or 60 monthly observations. In general, I would say that it does not really matter on how the beta is computed since the betas on google and yahoo are only ...


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Google uses the 1 factor CAPM model developed by Fama French (1974). Its a simple linear regression with the stock as dependent variable and the market portfolio as independent



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