Estimating Standard Deviation

[irchans]

Does anyone know an unbiased estimator for standard deviation given n samples? I guess that the most commonly used estimator is

<font class="small">Code:</font><hr /><pre>
Sqrt[
Total[(list-Mean[list])^2]/(Length[list]-1)
].
</pre><hr />

But that one is biased. (If you remove the square root, you get an unbiased estimator for variance.)