  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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