The number of degrees of freedom used in the divisor when computing MSE for a mu

Question

The number of degrees of freedom used in the divisor when computing MSE for a multiple linear regression model is equal to

a. the number of observations in the study

b. the number of independent variables in the model

c. the number of independent variables in the model

d. the number of observations, n, less one degree of freedom for the parameter appearing in the model

e. the number of observations less the number of independent variables in the model and less one for the constant term appearing in the model

Explanation / Answer

The number of degrees of freedom used in the divisor when computing MSE for a multiple linear regression model is equal to

Here the degree of freedom is the DF(error) which is equal to  the number of observations less the number of independent variables in the model and less one for the constant term appearing in the model.

Option e is correct.

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