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You'll need a spreadsheet like Excel. Do the following.

1) Get percentage daily returns for the stock between two dates (I suggest every day for a year). You can get this historical data from Yahoo Finance

2) Pick a benchmark index

3) Get percentage daily returns for the index between the two dates as well

4) Calculate the covariance of the stock with respect to the index and divide by the variance of the stock [the two excel functions you'll need are covariance.p() and variance.p() ]

Go to the related link below for a spreadsheet to do this.

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13y ago

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