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RE: st: Surface plots or heat maps


From   "Wallace, John" <John_Wallace@affymetrix.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Surface plots or heat maps
Date   Fri, 16 Feb 2007 12:43:23 -0800

Thank you for this, Maurizio.  I wasn't thinking about editing the code
for -spmap- when I said, "adapting", I was thinking of it as you
describe: altering the format of the data to work with your tool.  I'm
reading the Stata article you wrote in 2004 to see how I can make the
data congruent with a map representation.

Thank you for making your .ado's available to the rest of the community.
Sincerely,
John Wallace
---------------------------------------------------------------------

Date: Thu, 15 Feb 2007 09:24:35 +0100
From: Maurizio Pisati <maurizio.pisati@galactica.it>
Subject: Re: st: Surface plots or heat maps

Dear John,
you don't need to adapt -tmap- (or its successor -spmap-) to get surface

plots: you just need to have the data in proper format and then draw
them 
as if they represented a map. You can find some examples (not the data, 
just the pictures) in
<http://www.tstat.it/novita/conferenze/SUG2005/Pisati.pdf>http://www.tst
at.it/novita/conferenze/SUG2005/Pisati.pdf. 
Of course, having the data in proper format is another question.
Best,
Maurizio



At 22.11 14/02/2007, you wrote:
>I've gone through the FAQs and help files, but cannot find any
reference
>to Stata being able to generate surface plots or heat maps.  I did find
>a STB package called -surface written by Adrian Mander, but it appears
>to be for the Stata 7 graph engine. It also seems very bare bones and
>the z-axis scale is completely arcane (my data was decimal fractions
>less than 1 and the scale was in 10's of thousands).
>
>The only other possibility seems to be adapting -tmap (thematic maps by
>Maurizio Pisati) to work with a simple graphic file of the coordinate
>system I'd like to place my data on and encoding the z-axis in color.
>Is there an alternative I'm missing somewhere?  I don't think this is a
>particularly novel analysis - excel has a chart object for surface
>plots, but its cumbersome to move data in and out of Excel obviously.
>
>Thanks for any advice
>John Wallace
>

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