Re: [Geotools-devel] Quantile classification oddities

[Jody G. <jga...@re...>]

Andrea Aime wrote:
> Jody Garnett ha scritto:
>> What a difficult question; is there a strict definition of the 
>> quantile function we could grab from statistics or something?
>
> I did not find much, and none of what I've found talks about how to 
> handle flat areas in the data histogram:
> http://www.gisbanker.com/introduction_part5.htm
> http://www.geovista.psu.edu/grants/dg-qg/classing_epi/summary.html
> http://www.censusmapper.com/CM_Help/classifyfield.htm
> ...
Your first link there hits the nail on the head:
> Quantiles are best suited for data that is linearly distributed; in 
> other words, data that does not have disproportionate numbers of 
> features with similar values.
So basically user beware...

Jody