plotting group means
On Tue, Sep 9, 2008 at 6:56 AM, ONKELINX, Thierry
<Thierry.ONKELINX at inbo.be> wrote:
Dear Erich, Have a look at ggplot2 library(ggplot2) dataset <- expand.grid(x = 1:20, y = factor(LETTERS[1:4]), value = 1:10) dataset$value <- rnorm(nrow(dataset), sd = 0.5) + as.numeric(dataset$y)
Or with stat_summary: qplot(x, value, data=dataset, colour=y, group = y) + stat_summary(geom="line", fun="mean",size=2)