What is a good clean Perl on-line package or streaming statistics?

Are there any interrupted streaming statistics libraries for Perl Γ  la: http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#On-line_algorithm

I haven't found anything in CPAN yet, and I really don't want him to write code.

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You want Statistics :: Descriptive . The usual "sparse" version of the module (not Statistics::Descriptive::Full ) provides statistics that are available without storing the entire data set; variance is one of them.

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You can use the RSPerl module, which interacts with the R statistics package.

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