Iain Gallagher wrote: > Hi. > > I would like to add a horizontal line to each column of data on a > stripchart (vertical=T) to indicate the mean(rather like the package > Prism does - for those that have used this) for each dataset. I presume > the best way to do this would be with "lines" but after much trying / > playing about I can't figure it out. Can anyone help? > > Thanks > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Example adapted from ?stripchart: with(OrchardSprays, { stripchart(decrease ~ treatment, main = "stripchart(Orchardsprays)", ylab = "decrease", vertical = TRUE) m <- tapply(decrease, treatment, mean) segments(1:nlevels(treatment)-0.25, m, 1:nlevels(treatment)+0.25, m) }) Uwe Ligges ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html