[Python-ideas] Pre-PEP: adding a statistics module to Python

[Michele Lacchia]

Thank you! Yep, that makes really sense now!
Il giorno 05/ago/2013 17:13, "Steven D'Aprano" <steve at pearwood.info> ha
scritto:

> On 03/08/13 04:53, Michele Lacchia wrote:
>
>  As for Steven's implementation I think it's very accurate. I have one
>> question though. Why there is a class for 'median' with various methods
>> and
>> not one for 'stdev' and 'variance' with maybe two methods, 'population'
>> and
>> 'sample'?
>>
>
> Those familiar with calculator statistics will expect separate functions
> for sample variance and population variance, and the same for standard
> deviation. This is a de facto standard in nearly everything I've looked at
> (although numpy is a conspicuous exception), so I chose to follow the same
> convention.
>
> On the other hand, median is less commonly found on calculators and I did
> not want to overload the beginner with too many top-level median functions,
> so I made a decision to bless the version taught in secondary schools as
> the default (even though it is probably the least useful), and provide the
> others as methods.
>
> A previous version of this module had a single median function that took
> an optional argument to select between different kinds of median:
>
> median(data, scheme='grouped')
>
> I have come to the conclusion that having separate methods on median not
> only simplifies the implementation, but it also reads better:
>
> median.grouped(data)
>
>
> --
> Steven
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