Hi  this is my first email to the commonsmath group. I've been using commonsmath 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 commonsmath 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 commonsmath? If so, how do we proceed?
Thank you very much
Larry Diamond
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