Steven D'Aprano added the comment:

On 09/08/13 21:49, Oscar Benjamin wrote:

> I think that the argument `m` to variance, pvariance, stdev and pstdev
> should be renamed to `mu` for pvariance/pstdev and `xbar` for
> variance/stdev. The doc-strings should carefully distinguish that `mu`
> is the true/population mean and `xbar` is the estimated/sample mean
> and refer to this difference between the function variants.

Good thinking, and I agree.

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<http://bugs.python.org/issue18606>
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