The Mean Square Is the Sum of Squares Divided by
Though the above formula has been derived for AC current it is well applicable for AC voltage too. The only difference will arise that instead of taking instantaneous current values instantaneous voltage.
Mean Variance
From the above expression of rms value it is clear that rms value of AC current is equal to the square root of mean of the squares of the instantaneous current values.
. This is called MSE criterion. But in real modeling case MSE could be described as the addition of model variance model bias and irreducible uncertainty citation needed clarification neededAccording to the relationship the MSE of the estimators could be simply used for the efficiency comparison which includes the information of estimator variance and bias.
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