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From finance yahoo, download MONTHLY adjusted close prices for four of your favourite stocks during the period from Nov-1-2010 to Nov-1-2020. Estimate the means and

From finance yahoo, download MONTHLY adjusted close prices for four of your favourite stocks during the period from Nov-1-2010 to Nov-1-2020. Estimate the means and standard deviations of the monthly returns of the stocks. Estimate the covariance matrix of the monthly returns of the stocks.

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