You could try the following, assuming your data is in a collection called "data".

standardDeviation	
	| accumulator |	
	accumulator := DhbStatisticalMoments new.
	data do: [:each | accumulator accumulate: each]].
	^accumulator standardDeviation


Also, see the tests in DhbNumericalMethodsTestCase.

DhbNumericalMethodsTestCase>>testStatisticalMoments
DhbNumericalMethodsTestCase>>testStatisticalMomentsFast

HTH 


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.
> 
> 
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.squeakfoundation.org/pipermail/squeak-dev/attachments/20121116/0ce3d458/attachment.htm