Hello Larry,

The best way to contribute would be to create a JIRA issue describing
the enhancement, with your code attached as a patch.
(URL for Commons-Math JIRA: http://issues.apache.org/jira/browse/MATH)

Regards,
Julien

2009/12/11 Larry Diamond <larry_diam...@hotmail.com>:
>
> Hi - this is my first email to the commons-math group.  I've been using 
> commons-math for quite some time, but this is the first time I've attempted 
> to contribute.
>
> I've added semivariance calculations to my local build of commons-math and I 
> would like to contribute them.
>
> Semivariance is described a little bit on 
> http://en.wikipedia.org/wiki/Semivariance , but a real reason you would use 
> them is in finance in order to compute the Sortino ratio rather than the 
> Sharpe ratio.
>
> http://en.wikipedia.org/wiki/Sortino_ratio gives an explanation of the 
> Sortino ratio and why you would choose to use that rather than the Sharpe 
> ratio.  (There are other ways to measure the performance of your portfolio, 
> but I wont bore everybody with that stuff)
>
> I've already got the coding completed along with the test cases and building 
> using mvn site.
>
> The only two files I've modified is 
> src/main/java/org/apache/commons/stat/StatUtils.java and 
> src/test/java/org/apache/commons/math/stat/StatUtilsTest.java
>
> Is this something that people would like added to commons-math?  If so, how 
> do we proceed?
>
> Thank you very much
> Larry Diamond
>
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