[squeak-dev] statistics: standard deviation
djm1329 at san.rr.com
Sat Nov 17 07:51:55 UTC 2012
You could try the following, assuming your data is in a collection called "data".
| accumulator |
accumulator := DhbStatisticalMoments new.
data do: [:each | accumulator accumulate: each]].
Also, see the tests in DhbNumericalMethodsTestCase.
On Nov 15, 2012, at 16:34 , Sungjin Chun wrote:
> You can consult this book "Object-Oriented Implementation of Numerical Methods" for the code, especially Dhb... classes.
> On Fri, Nov 16, 2012 at 9:30 AM, Joseph J Alotta <joseph.alotta at gmail.com> wrote:
> I looked at the repositories that you mention and there is nothing there that I can work with. It is this very vast
> collection of code that has no documentation and no description.
> There seems to be methods for standard deviation but it involves subtracting moments from a larger object that calculated it somehow and is not to be found. It seems that one needs a vast understanding of the inner workings of smalltalk to use these classes. I was under the impression that knowledge of the hacky things is supposed to be hidden from a casual user or at least this is the design principle that is not followed.
> It is funny to me that there is not a simple answer to a simple question like this and I am left to coding standard deviation for myself.
> > On Nov 15, 2012, at 5:12, Joseph J Alotta <joseph.alotta at gmail.com> wrote:
> >> Does anyone know where I can find methods for statistics, like standard deviation?
> >> Regression would be nice also.
> >> Sincerely,
> >> Joe.
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