Divide the sum of the dispersion of the weighted average by n-1(how many weeks is n a * * * *), and then open the root sign to get the standard deviation.

The premise of calculating beta coefficient is to know the standard deviation of the yield of the whole market and calculate the covariance between the standard deviation of the market and the standard deviation of your yield. Beta coefficient = your return standard deviation/market standard deviation × covariance. If there are no market figures, industry figures will do.