Hi, I have two numeric columns (dat1 and dat2) to bwplot
data=expand.grid(dat1=rnorm(20,10,5),class=1:5,school=letters[1:3])) data$dat2=rnorm(300,13,6) What I want is to plot two boxes side by side for class, bwplot((dat1+dat2)~as.factor(class)|school,data=data) but the code does not work this way, instead it plots addtions of the two columns. I changed allow.multiple with no success. Your help is appreciated. Weidong Gu Department of Medicine University of Alabama, Birmingham ______________________________________________ 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.