Retrieve the daily data for market portfolio index and a stock price $($Samsung Electronics$).$

Assume that the risk$-$free rate is $3\%.$ Estimate the beta for the stock by using the data from

$2010$ to $2016$ and its $($annualized$)$ expected return as of the end of $2016.$ Use the historical mean

as the expected market excess return. Compare your estimates with the realized returns over

year $2017.$