I have what should be a simple question but I've been unable to solve it in a reasonable length of time. For example with data like > ge product response scenario 1 wine 5 base 2 steel 10 base 3 sugar 4 base 4 wine -10 policy 5 steel 1 policy 6 sugar -20 policy
(In reality there would be similar groups of data of various sizes). I would like to make dotplots with product on the left axis, x's for policy and o's for base scenario, say in red and blue. I would like to have horizontal lines from the product names across thru the x's and o's to the other side. Because positive or negative responses are important, I would like to have a vertical red line top to bottom at 0. I've experimented with dot.line, add.line to put in horizontal lines but was unsuccessful. Although the following code puts a red vertical line in, it is at the plot's left border. gedot <- function() { trellis.par.set(list(fontsize=list(text=12), dot.symbol=list(pch=c(1,4), col=c("blue","red")) )) print(dotplot(product ~ response, groups = scenario, pch=c(1,4), xlab="", ylab=NULL)) panel.abline(v=0, col="red", reference=FALSE) } Help please. ______________________________________________ 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.