[R] Grouped Boxplot

[David Winsemius]

Q1:
See if this seems any better. I took the liberty of reconstruction  
your initial example in a longer dataframe:

dta <- data.frame(val = sample(t,1000), g = gl(4, 250, labels=c("A",  
"B", "C", "D")) , G2 = gl(2,1, labels=c("XX", "YY")))

#arguments to data.frame are recycled so one does not need to make the  
gl call with a
# length of 500, in fact , that only confuses things (or at least it  
does for me).

table(dta$G2,dta$g)

#       A   B   C   D
#  XX 125 125 125 125
#  YY 125 125 125 125

  boxplot( val ~ G2 + g, data=dta)

Q2:

?boxplot  #especially parameter at=

boxplot( val ~ g + G2, data=dta, at = 0.8*c(1,2,3,4,6,7,8,9),  
boxwex=0.4)

-- 
David Winsemius

On Mar 4, 2009, at 1:50 PM, soeren.vogel at eawag.ch wrote:

> Pls forgive me heavy-handed data generation -- newby ;-)
>
> ### start ###
> # example data
> g <- rep.int(c("A", "B", "C", "D"), 125)
> t <- rnorm(5000)
> a <- sample(t, 500, replace=TRUE)
> b <- sample(t, 500, replace=TRUE)
>
> # what I actually want to have:
> boxplot(a | b ~ g)
>
> # but that does obviously not produce what I want, instead
> i <- data.frame(g, a, rep("one", length(g)))
> j <- data.frame(g, b, rep("two", length(g)))
> names(i) <- c("Group", "Number", "Word")
> names(j) <- c("Group", "Number", "Word")
> k <- as.data.frame(rbind(i, j))
> boxplot(k$Number ~ k$Word * k$Group)
> ### end ###
>
> Questions: (1) Is there an easier way? (2) How can I get additional  
> space between the A:D groups?
>
> Thank you
>
> Sören
>
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