Dear Researchers, I wish to plot mean, standard deviation, and standard error and I am using bwplot(). I have the following problems and sorry if maybe there are simple questions: 1- use color black for standarddevuation line and add horizontal end bar (as the commun graphic in scientific papers) 2- change the label in x axes (es; A and B, respect 1 and 2) 3- add the standard error around the mean with a shape of a rectangular (high equal to standard error and length possibile to be visible in a graphic) this is an exmple to explain better A <- data.frame(class=rep(1,25)) B <- data.frame(class=rep(2,25)) class <- data.frame(rbind(A,B)) mydata <- data.frame(H=runif(50),class) bwplot(H~class, data=mydata, horizontal=FALSE, panel=panel.meansdplot,mean.col = "black") really thanks and good week-end Gianni [[alternative HTML version deleted]]