In calculating the standard error of the estimate, SYX =MSE , there are n - k - 1 degrees of freedom, where n is the sample size and k represents the number of independent variables in the model. 
Definitions:
Portfolio Beta
A metric assessing how a portfolio's risk and volatility stack up against that of the general market.
Treasury Bills
Short-term U.S. government debt obligations backed by the Treasury Department with a maturity of less than one year.
Portfolio Expected Return
The anticipated return on an investment portfolio based on the predicted returns of its individual securities and their respective weights.
Royal Bank
A financial institution that is chartered or authorized to operate under a royal charter.
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