R help - Oct 2011 - US States percentage change plot

Hi, I would like to make a plot of the US states (or lower 48) that are
colored based upon a percentage change column. Ideally, it would gradually
be more blue the larger the positive change, and more red the more negative
is the change.

The data I have looks like:

       State Percent.Change
1    Alabama    0.004040547
2     Alaska   -0.000202211
3    Arizona   -0.002524567
4   Arkansas   -0.008525333
5 California    0.001828754
6   Colorado    0.011116150

I have read help for the maps library and similar plots online but can't
grasp how to map the percentage.change column to the map. thank in advance,

Michael Bailey

	[[alternative HTML version deleted]]

On 10/13/2011 12:45 AM, Michael Charles Bailey I wrote:
>        State Percent.Change
> 1    Alabama    0.004040547
> 2     Alaska   -0.000202211
> 3    Arizona   -0.002524567
> 4   Arkansas   -0.008525333
> 5 California    0.001828754
> 6   Colorado    0.011116150
Hi,

Please provide a reproducible example (up to the point where you are
stuck), as suggested in the posting guide.

good luck,
Paul

-- 
Paul Hiemstra, Ph.D.
Global Climate Division
Royal Netherlands Meteorological Institute (KNMI)
Wilhelminalaan 10 | 3732 GK | De Bilt | Kamer B 3.39
P.O. Box 201 | 3730 AE | De Bilt
tel: +31 30 2206 494

http://intamap.geo.uu.nl/~paul
http://nl.linkedin.com/pub/paul-hiemstra/20/30b/770

On 10/13/2011 11:45 AM, Michael Charles Bailey I wrote:
> Hi, I would like to make a plot of the US states (or lower 48) that are
> colored based upon a percentage change column. Ideally, it would gradually
> be more blue the larger the positive change, and more red the more negative
> is the change.
>
> The data I have looks like:
>
>         State Percent.Change
> 1    Alabama    0.004040547
> 2     Alaska   -0.000202211
> 3    Arizona   -0.002524567
> 4   Arkansas   -0.008525333
> 5 California    0.001828754
> 6   Colorado    0.011116150
>
> I have read help for the maps library and similar plots online but
can't
> grasp how to map the percentage.change column to the map. thank in advance,
>
Hi Michael,
I do a similar thing like this:

SEIFAcol<-color.scale(AU_SEIFA$SEIFA1dec[1:199],
  c(1,0.9,0.8,0.8),c(0.8,0.9,0.9,0.8),c(0.8,0.8,0.9,1),xrange=c(1,10))
...
plot(NSWmap,xlim=c(140,max(cdrt09$GeocodeX,na.rm=TRUE)),
  col=SEIFAcol)
SEIFAlegendcol<-color.scale(1:10,
  c(1,0.9,0.8,0.8),c(0.8,0.9,0.9,0.8),c(0.8,0.8,0.9,1))
color.legend(151.8,-37.5,152.3,-34.5,as.character(1:10),SEIFAlegendcol,
  align="rb",gradient="y")

In this case, Statistical Local Areas are being colored on the Index of 
Relative Social Disadvantage. The call to color.scale calculates a color 
for each of the 199 SLAs based on their IRSD score. If you want to 
define different color scales for positive and negative values, see the 
help page for color.scale (plotrix).

Jim

Unless your audience is mainly interested in Texas and California and is
completely content to ignore Rhode Island, then I would suggest that you look at
the state.vbm map in the TeachingDemos package that works with the maptools
package.  The example there shows coloring based on a variable.

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Michael Charles Bailey I
> Sent: Wednesday, October 12, 2011 6:46 PM
> To: r-help at r-project.org
> Subject: [R] US States percentage change plot
> 
> Hi, I would like to make a plot of the US states (or lower 48) that are
> colored based upon a percentage change column. Ideally, it would
> gradually
> be more blue the larger the positive change, and more red the more
> negative
> is the change.
> 
> The data I have looks like:
> 
>        State Percent.Change
> 1    Alabama    0.004040547
> 2     Alaska   -0.000202211
> 3    Arizona   -0.002524567
> 4   Arkansas   -0.008525333
> 5 California    0.001828754
> 6   Colorado    0.011116150
> 
> I have read help for the maps library and similar plots online but
> can't
> grasp how to map the percentage.change column to the map. thank in
> advance,
> 
> Michael Bailey
> 
> 	[[alternative HTML version deleted]]
> 
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> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.