<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">You could try the following, assuming your data is in a collection called "data".<br><br>standardDeviation<span class="Apple-tab-span" style="white-space: pre; "> </span><br><span class="Apple-tab-span" style="white-space: pre; "> </span>| accumulator |<span class="Apple-tab-span" style="white-space: pre; "> </span><br><span class="Apple-tab-span" style="white-space: pre; "> </span>accumulator := DhbStatisticalMoments new.<br><span class="Apple-tab-span" style="white-space: pre; "> </span>data do: [:each | accumulator accumulate: each]].<br><span class="Apple-tab-span" style="white-space: pre; "> </span>^accumulator standardDeviation<br><br><br>Also, see the tests in DhbNumericalMethodsTestCase.<br><br>DhbNumericalMethodsTestCase>>testStatisticalMoments<br>DhbNumericalMethodsTestCase>>testStatisticalMomentsFast<br><br>HTH <div><br></div><div><br><div><div>On Nov 15, 2012, at 16:34 , Sungjin Chun wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">You can consult this book "Object-Oriented Implementation of Numerical Methods" for the code, especially Dhb... classes.<br><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Nov 16, 2012 at 9:30 AM, Joseph J Alotta <span dir="ltr"><<a href="mailto:joseph.alotta@gmail.com" target="_blank">joseph.alotta@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I looked at the repositories that you mention and there is nothing there that I can work with. It is this very vast<br>
collection of code that has no documentation and no description.<br>
<br>
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.<br>
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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.<br>
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> On Nov 15, 2012, at 5:12, Joseph J Alotta <<a href="mailto:joseph.alotta@gmail.com">joseph.alotta@gmail.com</a>> wrote:<br>
><br>
>> Does anyone know where I can find methods for statistics, like standard deviation?<br>
>><br>
>> Regression would be nice also.<br>
>><br>
>> Sincerely,<br>
>><br>
>> Joe.<br>
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