How can I reproduce this graph in ggplot2 (regression lines and data point superimposed). Thanks, Juliet
filename="http://personality-project.org/r/datasets/heating.txt"; heating=read.table(filename,header=TRUE) symb=c(19,25,3,23) colors=c("black","red","green","blue") plot(degreedays,therms,pch=symb[Location],col=colors[Location],bg=colors[Location],cex=1.0) by(heating,Location,function(x) abline(lm(therms~degreedays,data=x))) ______________________________________________ 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.
