hello! i need help for a specific graphic issue
On Wed, Mar 12, 2008 at 5:37 AM, Giacomo Prodi <bonoricus at yahoo.it> wrote:
hello, ladyes and gentlemans. check this: means<-c(4,6,8) stand.error<-c(0.1,0.3,0.5) now i've strongly tryed to scatterplot the means(y-axis),by showing their sd with the arrow(..,code=3,angle=90) function. The problem is that my x-axis has categorical values (say, factor(x)), and the arrows() can't recognize them as right coordinates. ????? thank you all in advance B.F. insubria university (varese)
This is a bit easier to do with ggplot2:
df <- data.frame(
trt = factor(c("a", "b", "c")),
mean = c(4,6,8),
se = c(0.1,0.3,0.5)
)
install.packages("ggplot2")
library(ggplot2)
qplot(trt, mean, data=df)
qplot(trt, mean, data=df, min=mean - se, max = mean + se, geom="pointrange")
Hadley