Statistics library

[dsimcha]

== Quote from Bill Baxter (wbaxter at gmail.com)'s article
> On Fri, Oct 24, 2008 at 7:43 AM, dsimcha <dsimcha at yahoo.com> wrote:
> > Since there's really no good comprehensive statistics library for D (Tango has
> > a little bit, the beginnings of a few are on dsource, but nothing much), Ive
> > been rolling my own statistics functions as necessary.  Almost by accident, it
> > seems like I've built up the beginnings of a decent statistics library.  I'm
> > debating whether it might be interesting enough to people to be worth
> > releasing, and whether enough community help would be available to really make
> > it production quality, or to merge it with other people's efforts in this
> > area.  The following functionality is currently available:
> >
> > Correlation (Pearson, Spearman rho, Kendall tau).   Note that the     Kendall
> > tau correlation is a very efficient O(N log N) version.
> >
> > Mean, standard deviation, variance, kurtosis, percent variance for arrays of
> > numeric values.
> >
> > Shannon entropy, mutual information.
> >
> > Kolmogorov-Smirnov tests
> >
> > Binomial, hypergeometric, normal, Poisson, Kolmogorov CDFs, hypergeometric,
> > Poisson, binomial PDFs.
> >
> > Inverse normal distribution, and normally distributed random number generation.
> >
> > A struct to generate all possible permutations of a sequence.
> I don't know what a lot of those things are, but statistics to me
> means you will probably have (or eventually want) things like
> covariance which are best represented as matrices.  Does your package
> also have a matrix library?
> --bb

No, it doesn't have a matrix library right now.  I make no claim that it is in any
way complete right now, but I do think it has some pretty useful stuff that's not
likely to be anywhere else for D.