[GRASS-user] Central tendency with Grass

GRASS GRASS user
1

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
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2

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

3

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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4

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
>
> _______________________________________________
> grass-user mailing list
> grass-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>
>

5

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

Thank you, I'll try it. I also found that for R:
http://cran.r-project.org/web/packages/aspace/index.html
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6

Well, CRIMESTAT seems to work with WINE on Ubuntu 8.10. I start it without
any errors (but only started, didn' try to load data and perform analysis!).

leonidas wrote:

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

Thank you, I'll try it. I also found that for R:
http://cran.r-project.org/web/packages/aspace/index.html

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