[STATSGRASS] Any suggestions?

[Roger Bivand]

On Tue, 17 Oct 2006, Raffaele Morelli wrote:

> Hi everybody.
> 
> I am running Grass6 and R start doing some simple statistical analysis.
> I got my vectors connected to a database through a mysql driver.

So the point/polygon geometries are in GRASS and the attribute data is in 
the database? R could also read the attribute tables directly, rather than 
pulling them through GRASS, if you like, though maintaining integrity will 
need watching.

> 
> I would like to start plotting maps with graphs on it so I need to fetch
> attribute data of layers and represent them as histogram or boxplot.
> Can you suggest me some resources?
> 

This isn't very clear - each geometry object has a single observation on 
each attribute field, so the histograms (for each place - point/polygon) 
are across multiple fields? To get boxplots, see symbols(), but a good 
deal of massaging will need to be done to work across columns rather than 
down them. For placing histograms, it may be you'll need to go to the 
gridBase package, documented in Paul Murrell's R Graphics (CRC Press) and 
in R News October 2003, Fig. 2 is suggestive of the flexibility.

> Thanks
> 

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no