[R] ggplot2 - boxplot of variables / columns

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Tue Apr 21 17:10:02 CEST 2009


Dear Andreas,

melt() and cast() are nice tools for this kind of problems. They both
reside in the reshape package that automatic loaded when ggplot2 is.

a <- rnorm(100)
b <- rnorm(100,1,2)
c <- rnorm(100,2,0.5)
ds <- data.frame(a = a, b = b, c = c)
library(ggplot2) # loads qqplot2
ggplot(melt(ds), aes(x = variable, y = value)) + geom_boxplot()

HTH,

Thierry


------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium 
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be 
www.inbo.be 

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens Andreas Christoffersen
Verzonden: dinsdag 21 april 2009 16:42
Aan: r-help at r-project.org
Onderwerp: [R] ggplot2 - boxplot of variables / columns

Hi,

ggplot/qplot is great - it has really helped me do some nice things.
However, simple boxplot of different columns/variables is a bit
tricky, because of (i think) qplot's generic Y conditional on X input
form. Se below.

# Some data:
a <- rnorm(100)
b <- rnorm(100,1,2)
c <- rnorm(100,2,0.5)
# normal boxplot of a,b,c
boxplot(a,b,c) # Looks good
library(ggplot2) # loads qqplot2
# Tries do replicate the simple boxplot
qplot(a,b,c, geom="boxplot") # Not good
# Workaround
d <- c(a,b,c)
e <- c(rep("a",100),rep("b",100),rep("c",100))
qplot(e,d,geom="boxplot") # Works - but there must be a simpler way?

What is the simple to compare multiple variables like this?

thanks in advance

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