[GRASS-user] Central tendency with Grass

[mitch]

On Wed, 2009-03-04 at 13:23 -0800, leonidas wrote:
> 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
> 

If you happened to have a Windows machine (I don't think it runs on
Linux)I would try this one http://www.icpsr.umich.edu/CRIMESTAT/ 

Cheers


> 
> 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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> > 
> > 
>