On Jun 29, 2010, at 8:42 PM, Pablo Cerdeira wrote:
Hi All,
this is my first mail here.
I'm trying to plot a multiline chart grouping values with no
success. I have
read a lot in the official Wiki and also searched via Google, but I
did not
find anything.
I'm importing some data from a cvs file. Here is a sample:
YEAR,AREA,CASES
1988,CONTRACTS,286
1988,INTERNATIONAL,189
1988,FAMILY,385
1988,TAXATION,177
1989,CONTRACTS,233
1989,INTERNATIONAL,431
1989,FAMILY,425
1989,TAXATION,201
1990,CONTRACTS,190
1990,INTERNATIONAL,302
1990,FAMILY,303
1990,TAXATION,209
...
"t <- read.csv("file.csv", header=TRUE)"
So far so good...
But the problem is: I'd like to create a multiline plot, one line
per AREA,
showing the evolution of the number of CASES per YEAR.
I know how to do it in Excel, using a Pivot Table. But I'm trying
hard to do
the same with R but I have no idea on how to do it.
Can someone help me?
> txt <-textConnection("YEAR,AREA,CASES
+ 1988,CONTRACTS,286
+ 1988,INTERNATIONAL,189
+ 1988,FAMILY,385
+ 1988,TAXATION,177
+ 1989,CONTRACTS,233
+ 1989,INTERNATIONAL,431
+ 1989,FAMILY,425
+ 1989,TAXATION,201
+ 1990,CONTRACTS,190
+ 1990,INTERNATIONAL,302
+ 1990,FAMILY,303
+ 1990,TAXATION,209")
> t <- read.csv(txt, header=TRUE)
> t
YEAR AREA CASES
1 1988 CONTRACTS 286
2 1988 INTERNATIONAL 189
3 1988 FAMILY 385
4 1988 TAXATION 177
5 1989 CONTRACTS 233
6 1989 INTERNATIONAL 431
7 1989 FAMILY 425
8 1989 TAXATION 201
9 1990 CONTRACTS 190
10 1990 INTERNATIONAL 302
11 1990 FAMILY 303
12 1990 TAXATION 209
> require(lattice)
> help(package=lattice)
> xyplot(CASES ~ YEAR|AREA, data=t)
> ?xyplot
starting httpd help server ... done
> xyplot(CASES ~ YEAR|AREA, data=t, type="l")
> xyplot(CASES ~ YEAR, group=AREA, data=t, type="l")
--
David Winsemius, MD
West Hartford, CT
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