I just pulled this out of the voronoizer code I wrote a few weeks ago, because I ended up wanting it for another side project. Rather than jumping to pollution of hackage, I thought I’d do a quick poll if anyone thinks they’d ever use it.
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I’m not sure I would use it, but this is very cool!
I’m not qualified to compare, but I know that there are several existing libraries for single-pass statistics:
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Ah, thanks! If nothing else, that reminds me that one of the things I specifically wanted here was statistics on a vector space, which sadly I wasn’t able to find easily usable elsewhere. The packages you link to are indeed a great existing alternative if you are computing statistics on scalars!
Would it be possible to add the functionality monoidal-stats has into e.g. monoid-statistics?
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Sounds quite reasonable to me! I filed Incorporate stats for vector spaces · Issue #8 · Shimuuar/monoid-statistics · GitHub to see there’s interest from the maintainer of that package. It seems recently maintained, so there’s probably reason to be hopeful here.
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Just to jump on the “have you seen”’s, my foldl-statistics package also contains a type (LMVSKState) which computes the length, sum, mean, skewness and kurtosis of a set of Doubles and has a Monoid instance.
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One thing that I had in mind since some time that seems related: You could have a finger tree indexed by a monoidal statistic. When adding further values to it, it automatically keeps the statistic of the whole set updated.
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