Jody Garnett ha scritto:
> Andrea Aime wrote:
>> Well, since I have a customer that needs this, and there seems to be
>> no agreement (or lack of interest) on what to do, I'll roll a custom
>> variant of the quantile algorithm inside GeoServer that does what I
>> suggested, set apart the flat ar
That is also an option Andrea; any chance we can come up with unqiue
names for these two ideas? ie implement and document them as separate
functions...
> The first thing I need, is to change the generated rules so that they
> all use closed intervals, such as:
> 0 <= x <= 10
> 10 < x <= 20
> 20 <
Andrea Aime wrote:
> Well, since I have a customer that needs this, and there seems to be
> no agreement (or lack of interest) on what to do, I'll roll a custom
> variant of the quantile algorithm inside GeoServer that does what I
> suggested, set apart the flat areas of the histogram in their o
Andrea Aime ha scritto:
> Andrea Aime ha scritto:
> ...
>> Again, not very useful... it's telling you that at the 33% break there
>> is a 0, and by applying it, you'd get a class that ends with 0, and
>> another that starts with 0. Which is something the layman using
>> the application does not und
Andrea Aime ha scritto:
...
> Again, not very useful... it's telling you that at the 33% break there
> is a 0, and by applying it, you'd get a class that ends with 0, and
> another that starts with 0. Which is something the layman using
> the application does not understand, it does not make sense
Adrian Custer ha scritto:
> Hey all,
>
> Wherein we discover that stats are hard, even for the simple
> questions...
>
>
> On Tue, 2008-05-20 at 10:18 +0200, Andrea Aime wrote:
>> Jody Garnett ha scritto:
>>> What a difficult question; is there a strict definition of the quantile
Andrea Aime wrote:
> Yeah, silly. Unfortunately that's exactly what you're getting today
> out of the quantile classification simple. I have cases, with real
> data, where the current function generates 3 subsequent intervals at 0.
Okay since the stats are not helping us that much let me share wi
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:
> htt
Hey all,
Wherein we discover that stats are hard, even for the simple
questions...
On Tue, 2008-05-20 at 10:18 +0200, Andrea Aime wrote:
> Jody Garnett ha scritto:
> > What a difficult question; is there a strict definition of the quantile
> > function we could grab from statist
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/introduc
What a difficult question; is there a strict definition of the quantile
function we could grab from statistics or something?
Given you example I want to ask: what is more important; the number of
classifications, or the fact that they are "even" in size...
If we go for even in size; you may get
Hi,
I'm having some troubles using the quantile classification algorithm.
As you may know, quantile figures out how to classify a range of numbers
in a way that each class has the same number of features in it.
Consider a case when an attribute has the following values (in different
features): {0
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