(This article was originally published at Adventures in R, and syndicated at StatsBlogs.)
library (MASS) covar<-mvrnorm(250, c(0, 0), matrix(c(1, 0.00, 0.00, 1), 2, 2)) mydata<-data.frame(covar) names(mydata)<-c("sat", "mot") mydata$admin<- mydata$sat + mydata$mot mydata$admin2<- ifelse (mydata$admin >=quantile(mydata$admin, .85), "pass", "fail") library(ggplot2) qplot(sat,mot, data = mydata, color = admin2)
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