  Dear Dr. Hijman,
  Thank you for the reply.
  Initially I was thinking in using a GIS approach, as a state map would to be involved in the process.
  Please check this link: http://img836.imageshack.us/img836/7021/fig6vdist.png
  A work colleague produced this map using ArcGIS, but at a cost of almost a entire morning.
  I was wondering if it is possible to reproduce that using R + GIS packages.
  Best regards,
  Thiago.

--- On Mon, 23/8/10, Robert J. Hijmans <r.hijmans@gmail.com> wrote:

From: Robert J. Hijmans <r.hijmans@gmail.com>
Subject: Re: [R-sig-Geo] Mapping multiple attributes at once
To: "Thiago Veloso" <thi_veloso@yahoo.com.br>
Cc: r-sig-geo@stat.math.ethz.ch
Date: Monday, 23 August, 2010, 13:25

Dear Thiago,

If you are using (basic) 'plot' you can pass a vector with the
required sizes, i.e. your variable, perhaps after a transformation, as
cex argument. Same approach works for col.

plot(1:10, cex=c(1:5,1:5), col=rep(c('red', 'blue'), each=5), pch=20)

Robert

On Mon, Aug 23, 2010 at 7:26 AM, Thiago Veloso <thi_veloso@yahoo.com.br> wrote:
>   Dear SIG colleagues,
>   In my present study I need to plot a map containing two different attributes of some localities.    I figured out that a convenient and didactic way would be via something like bubble plots. For example, the size of the circle would be proportional to a certain range of values (4 categories) and its inner colors (also 4 categories) would be proportional to the p-values of a statistical test.
>   Is it possible to implement that idea using SIG tools in R? Any suggestions on how to do it??
>   Thanks in advance and best wishes,
>   Thiago.
>
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