info prev up next book cdrom email home

Standard Error

The square root of the Estimated Variance of a quantity. The standard error is also sometimes used to mean

\begin{displaymath}
\mathop{\rm var}\nolimits (\bar x) = \sum_{i=1}^n \left({1\o...
...{i=1}^n \left({1\over n}\right)^2\sigma^2 = {\sigma^2\over n}.
\end{displaymath}

See also Standard Deviation




© 1996-9 Eric W. Weisstein
1999-05-26