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

Question

Are there any prerolled streaming statistics libraries for Perl à la: http://en.wikipedia.org/wiki/Algorithms%5Ffor%5Fcalculating%5Fvariance#On-line%5Falgorithm

I haven't found anything on CPAN yet and I really don't want to have to code one myself.

Answer 1

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

Answer 2

You can use RSPerl module that interfaces with the R statistics package.