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Re: st: spmap guidance: Two variables resulting in shaded and sized circles centered on lon/lat


From   Maurizio Pisati <maurizio.pisati@unimib.it>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: spmap guidance: Two variables resulting in shaded and sized circles centered on lon/lat
Date   Tue, 13 Sep 2011 08:14:18 -0500

As Nick correctly pointed out, the current version of -spmap- doesn't allow automatic shading of proportional symbol. However, James can achieve the desired result going through a quick intermediate step. Here's an example using the datasets distributed with -spmap-:


use "Italy-RegionsData.dta", clear

xtile for4q = fortell, nquant(4)

save "temp.dta", replace

use "Italy-OutlineData.dta", clear

spmap using "Italy-OutlineCoordinates.dta", id(id)          ///
   point(data("temp.dta") by(for4q) xcoord(xcoord)          ///
         ycoord(ycoord) proportional(pop98) fcolor(Blues)   ///
         ocol(black ..) size(*1.0))


Best wishes,
Maurizio





Il giorno 11/set/2011, alle ore 22.40, James Sams ha scritto:

> I'm trying to use spmap to create a graph where each geographic entity for 
> which I have data is represented by a circle centered over its central latitude 
> and longitude sized by the population of data I have in that geographic entity 
> and shaded according to the magnitude of another variable. So, the data is:
> 
> Let's say the dataset to map looks like:
> geo_id (specifically 5 digit county-level fips codes)
> LON
> LAT
> id (generated by shp2dta)
> population
> variable_to_shade_by 
> 
> The coordinates file is uscoord (also generated by shp2dta) and has variables:
> _ID, _X, and _Y
> 
> 
> Is spmap the appropriate tool to do this? I don't see how to get the options to 
> interact in the appropriate manner. Some pointers in the right direction would 
> be much appreciated.
> 
> 
> -- 
> James Sams
> sams.james@gmail.com
> *
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