[postgis-users] quantiles, quartiles, or jenks natural breaks

[Alex Mayrhofer]

Paul Ramsey wrote:
> I did some in PHP, but the algorithms are relatively braindead, the 
> quantile stuff in particular.  Jenks I did some research on but never 
> really found a definitive description of the process.  Some of the 
> descriptions ended up sounding like a k-means clustering idea, which is 
> not cheap!

I've found this: http://choroware.sourceforge.net/

It seems to do various algorithms in terms of classification.

cheers

Alex
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