Dear Rexperts, I am trying to add a '+' identifying the mean in a boxplot using the following sizelist <- split(size, grp) centers <- boxplot(sizelist, style.bxp = "att", medpch = "o", ylab = "Prostate Volume (cm3)") points(centers, unlist(lapply(sizelist, mean)), pch = "+") But, I get error Error in xy.coords(x, y) : 'x' and 'y' lengths differ which I do not understand. The data follows grp size AE 9.132 AE 10.07 AE 20.077 AE 14.691 AE 23.698 E1 10.356 E1 6.313 E1 21.708 E1 12.651 E1 15.464 E2 37.2 E2 12.639 E2 16.791 E2 36.996 E2 22.808 CC 1.975 CC 3.125 CC 4.433 CC 6.154 CC 4.175 NC 9.301 NC 13.531 NC 12.84 NC 14.336 NC 25.102
Please help. -- Oscar Oscar A. Linares, MD Translational Medicine Unit LaPlaisance Bay, Bolles Harbor Monroe, Michigan 48161 Department of Medicine, University of Toledo College of Medicine Toledo, OH 43606-3390 Department of Internal Medicine, The Detroit Medical Center (DMC) Harper University Hospital Wayne State University School of Medicine Detroit, Michigan 48201 [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org 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.