Definition:Error Mean Square

Definition

Let $S$ be a set of data.

The error mean square of $S$ is the error sum of squares of $S$ divided by the degrees of freedom of $S$.

Hence the error mean square is an unbiased estimator of variance of error.

Also see

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Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): error mean square
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): error mean square