[GRASS-user] Central tendency with Grass

[leonidas]

Niko,
I need a tool to find spatial mean (mean center), weighted mean center, and
standard distance.
You can take a look in this article to understand what I mean (in greek): 
http://www.demography-lab.prd.uth.gr/DDAoG/edu/case/2/kentro-v.htm
So, I'm looking for a tool that I'll define as input a point shapefile (or
vector map in grass) with a field for weight values(for weighted mean
center) and then, as an output, I'll get a shapefile with one point for
spatial mean, another shapefile with a point as the weighted mean center and
finally a shapefile with a polygon representing the standard distance as
circle.Thank you for the interest, Leonidas


Nikos Alexandris wrote:
> 
> On Mon, 2009-03-02 at 01:02 -0800, leonidas wrote:
>> I need to calculate some Central tendency quotients like Mean Center,
>> Weighted Mean Center and Standard Distance. Are there any tools to
>> implement
>> it with Grass Gis (or other OS software)? It may be easy to extract the
>> point coordinates of a shp and make the calculations but I'd like to know
>> if
>> there is any build in tool in Grass GIS or other OS soft.Thanks, Leonidas
> 
> Leonida,
> 
> could you be a bit more specific?
> 
> You need to upload in specific points values like mean, weighted mean,
> standard distance, etc? If yes, how big should be your radius for each
> point, i.e. how big will be your circle from which the numbers will
> come?
> 
> There are lot's of tools in GRASS and you just need to synthesise them
> to find the solution you need.
> 
> Cheers, Nikos
> 
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> 

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