[R] Lines connecting the boxes in a boxplot Hello, I'm currently using a boxplot to visualize data for three different models. As I have three models, I'm plotting three parallel boxplots for each factor. This works fine - what I need now is a line connecting the medians of each boxplot of each model. I want to do this in order to visualize the trend that one of the models exhibit. Basically, I want to plot a curve for each model (slightly offset on the x axis), with a boxplot on each datapoint. It's only an idea, and I don't know if it's not too confusing after adding the lines... Is it possible? Has anyone done this before? Sorry if this has been asked before or is a standard feature, I simply have now clue how to name the feature I want. Ergo: I cannot search for it.. :\\ Regards, Arne PS: this is my current code require(gplots) boxwex=0.15 data <- read.table("all_runs_fitness.data"); colnames(data)=c("model","matrix","fitness") boxplot(fitness ~ matrix,         data=data, boxwex=boxwex, at=(1:7 - 0.2),         main="Fitness for Matrix/Models", xlab="Matrixtype",         ylab="Fitness", ylim=c(20,100),          subset=(model=="dyn"), col="lightblue", xaxt="n", whisklty=1) boxplot(fitness ~ matrix,         data=data, boxwex=boxwex, at = 1:7, add=TRUE,          subset=(model=="dl3"), col="mistyrose", xaxt="n", whisklty=1) boxplot(fitness ~ matrix,         data=data, boxwex=boxwex, at=(1:7 + 0.2), add=TRUE,          subset=(model=="dl4"), col="lightcyan", xaxt="n", whisklty=1) axis(1, 1:8-0.5, labels=FALSE) axis(1, 1:7, tck=FALSE, labels=levels(data[,2])) smartlegend(x="left", y="bottom", inset = 0.01,             c("dyn","dl3","dl4"), fill = c("lightblue", "mistyrose", "lightcyan")) ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.