[R] map at fips level using multiple variables

[Albyn Jones]

since each county gets a single color, you would need to combine two
color schemes.  I am skeptical that this will work well, but you could
try using rgb().  For example - code one variable using the red
component, the other using the blue component.

albyn

On Wed, Dec 07, 2011 at 11:14:27PM -0500, bby2103 at columbia.edu wrote:
> Hi David,
> 
> Sorry it sounds vague.
> 
> Here is my current code, which gives the distribution of family size
> at US county level. You will see on a US map family size
> distribution represented by different colors.
> 
> Now if i have another variable income, which has 3 categories(<50k,
> 50k-80k,>80k). How do I show 5x3 categories on the map? I guess I
> could always create a third variable to do this. Just wondering
> maybe there is a function to do this readily?
> 
> Thank you!
> Bonnie Yuan
> 
> y=data1$size
> x11()
> hist(y,nclass=15) # histogram of y
> fivenum(y)
> # specify the cut-off point of y
> y.colorBuckets=as.numeric(cut(y, c(1,2, 3,6)))
> # legend showing the cut-off points.
> legend.txt=c("0-1","1-2","2-3","3-6",">6")
> colorsmatched=y.colorBuckets[match(county.fips$fips,fips[,1])]
> x11()
> map("county", col = colors[colorsmatched], fill = TRUE, resolution = 0)
> map("state", col = "white", fill = FALSE, add = TRUE, lty = 1, lwd = 0.2)
> title("Family Size")
> legend("bottom", legend.txt, horiz = TRUE, fill = colors, cex=0.7)
> 
> 
> 
> Quoting David Winsemius <dwinsemius at comcast.net>:
> 
> >
> >On Dec 7, 2011, at 6:12 PM, bby2103 at columbia.edu wrote:
> >
> >>Hi, I just started playing with county FIPS feature in maps
> >>package  which allows geospatial visualization of variables on
> >>US county  level. Pretty cool.
> >
> >Got code?
> >
> >>
> >>I did some search but couldn't find answer to this question--how
> >>can I map more than 2 variables on US map?
> >
> >"2 variables" is a bit on the vague side for programming purposes.
> >
> >>For example, you can map by the breakdown of income or family
> >>size.  How do you further breakdown based on the values of both
> >>variables  and show them on the county FIPS level?
> >
> >"breakdown" suggests a factor construct. If so, then :
> >
> >?interaction
> >
> >But the "show" part of the question remains very vague.
> >
> > Can't you be a bit more specific? What DO you want?
> >
> >-- 
> >David Winsemius, MD
> >West Hartford, CT
> 
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> 

-- 
Albyn Jones
Reed College
jones at reed.edu