Re: [R] proportional symbol map ggplot

[Strategische Analyse CSD Hasselt]

Hello Scott,

Thank you for the tips (I have posted the issue on the google group too), but 
there's nothing on these or other websites that gives an answer on our question.
Following the traditional used rules of making a symbol plot, the used symbols 
should have the same proportions, based on area, then the values have.
Unfortunately, this is not so in the plots we make with the code below 
(scale_area).


Yours sincerely,

Ann Frederix

- Original Message - 
  From: Scott Chamberlain 
  To: Strategische Analyse CSD Hasselt 
  Sent: Monday, March 14, 2011 4:05 PM
  Subject: Re: [R] proportional symbol map ggplot


  There is a ggplot2 google groups mailing list that you may get more 
appropriate help from:


  http://groups.google.com/group/ggplot2?pli=1


  and the ggplot2 website is very helpful
  http://had.co.nz/ggplot2/
  On Monday, March 14, 2011 at 9:41 AM, Strategische Analyse CSD Hasselt wrote:

Hello,

we want to plot a proportional symbol map with ggplot. Symbols' area should 
have the same proportions as the scaled variable.
Hereby an example we found on 
http://www.r-bloggers.com/bubble-chart-by-using-ggplot2/ . In this example 
we see the proportions of the symbols' area are different from the 
proportions of the scaled variable:

crime - 
read.csv(http://datasets.flowingdata.com/crimeRatesByState2008.csv;, 
header=TRUE, sep=\t)
p - ggplot(crime, aes(murder,burglary,size=population, label=state))
p - p+geom_point(colour=red) +scale_area(to=c(1,20))+geom_text(size=3)

Example:
proportion population Pennsylvania/Tennessee= 2.003
proportion symbols' area Pennsylvania/Tennessee= +/- 2.50

proportion population California/Florida= 2.005
proportion symbols' area California/Florida= +/-2.25

What we would like is that the proportion of the symbols' area is also 
equal 
to 2.0.

We see the same in the legend:
proportion population 1.6e+07 / 4.0e+06 = 4.0
proportion symbols' area 1.6e+07 / 4.0e+06= +/-5.0


Thanks in advance!

Ann Frederix
Robbie Heremans

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Re: [R] proportional symbol map ggplot

[Hadley Wickham]

On Mon, Mar 14, 2011 at 9:41 AM, Strategische Analyse CSD Hasselt
csd...@fedpolhasselt.be wrote:
 Hello,

 we want to plot a proportional symbol map with ggplot. Symbols' area should
 have the same proportions as the scaled variable.
 Hereby an example we found on
 http://www.r-bloggers.com/bubble-chart-by-using-ggplot2/ . In this example
 we see the proportions of the symbols' area are different from the
 proportions of the scaled variable:

 crime -
 read.csv(http://datasets.flowingdata.com/crimeRatesByState2008.csv;,
 header=TRUE, sep=\t)
 p - ggplot(crime, aes(murder,burglary,size=population, label=state))
 p - p+geom_point(colour=red) +scale_area(to=c(1,20))+geom_text(size=3)

 Example:
 proportion population Pennsylvania/Tennessee= 2.003
 proportion symbols' area Pennsylvania/Tennessee= +/- 2.50

 proportion population California/Florida= 2.005
 proportion symbols' area California/Florida= +/-2.25

 What we would like is that the proportion of the symbols' area is also equal
 to 2.0.

To do that you need to make sure the lower limit extends to 0 and the
size of the smallest circle is also 0. I think something like
scale_area(to=c(0, 20), limits = c(0, 4e7), breaks = 1:4 * 1e7) should
suffice.

It would also be helpful if you stated how you calculated the areas.

Hadley

-- 
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/

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