[Python-ideas] Proposal: add a calculator statistics module

[Stephen J. Turnbull]

Steven D'Aprano writes:

 > I propose adding a basic calculator statistics module to the standard 
 > library, similar to the sorts of functions you would get on a scientific 
 > calculator:
 > 
 > mean (average)
 > variance (population and sample)
 > standard deviation (population and sample)
 > correlation coefficient

+1 for these.

 > and similar.

I'm not sure about that.  I immediately thought "how about bivariate
linear regression?", but that's actually misleading in many cases.
Doing anything more general is beyond the scope of "like a typical
scientific/statistical hand calculator".

On the other hand, well-commented code showing how to do the bivariate
case would help people to implement more general cases.  Ditto for
other common tasks like chi-square tests.