Hi, I am using "bwplot" to depict the box plots for two group by 6 time points. I need to add 6 p-values in each time point to compare two group at each time point. P-values are (0.0020, 0.0204, 0.3361, 0.0185, 0.1981, and 0.6677). I could depict the two box plots per each time point using the code below, but I am not sure how to add a p-value per each time point. Please let me know if you know how to do it. Thanks! library(lattice) library(Hmisc) library(gridExtra) font.settings <- list( font = 1, cex = 1, fontfamily = "serif") my.theme <- list( box.umbrella = list(col = "black"), box.rectangle = list(fill= rep(c("black", "black"),2)), box.dot = list(col = "black", pch = 3, cex=2), plot.symbol = list(cex = 0.5, col = 1, pch= 0), #outlier size and color par.xlab.text = font.settings, par.ylab.text = font.settings, axis.text = font.settings, superpose.symbol=list(fill=c("white","black")), # boxplots superpose.polygon=list(col=c("white","black")), # legend par.sub=font.settings) kccqd <- sas.get("I:/Protocol/Datasets/2013/09302013/DataForQOL/", "kccq_long",formats=F, sasprog=sasprog) kccqlong <- subset(kccqd, month <72) id <- (kccqlong$master.id) group <- (kccqlong$rdrug12) month <- (kccqlong$month) kccq.pred <- (kccqlong$kccq.pred) kccq.raw <- (kccqlong$kccq.raw) bwplot(kccq.raw ~ time, data = kccqlong, groups = group, ylim=c(-100,100), pch = "|", box.width = 1/3, auto.key = list(points = FALSE, rectangles = TRUE, space = "right", title="Treatment", cex.title=1), panel = panel.superpose, ylab = "Change in KCCQ (Raw) from baseline", xlab="Visit", par.settings = my.theme, panel.groups = function(x, y, ..., group.number) { panel.bwplot(x + (group.number-1.5)/3, y, ...) }) [[alternative HTML version deleted]]