Disturbance-Variance Estimation in Simultaneous Equations When Disturbances are Small
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Employing the small-disturbance approach, I study the bias and mean squared error of a class of estimators of the variance of the disturbances in a simultaneous linear stochastic equation model. The estimator considered is the residual sum of squares after estimation of the structural parameters by a k-class estimator, divided by an arbitrary scalar. The scalar which minimizes the mean squared error is (T—n+2), regardless of which k-class estimator is used, where T is the number of observations and n is the number of structural parameters estimated. Using the scalar (T—n+2), the member of the k-class that minimizes the mean squared error is classical least squares.