All,
On p.52 of Deepayan Sarkar's Lattice book there is a nice plot of showing residuals with median lines superimposed or various groups: library("lattice") stripplot(sqrt(abs(residuals(lm(yield~variety+year+site)))) ~ site, data = barley, groups = year, jitter.data = TRUE, type = c("p", "a"), fun = median) Suppose we wanted to make a similar plot for a numeric x-axis. Is there any way to do this with stripplot or does one have to xyplot and presumably panel functionality to get the median line? This does not work: barley$site.numeric =as.numeric(barley$site) stripplot(sqrt(abs(residuals(lm(yield~variety+year+site)))) ~ site.numeric, data = barley, groups = year, jitter.data = TRUE, type = c("p", "a"), fun = median) Any tips much appreciated. For my data I had made my x-axis a factor but forgot that this doesn't work since the intervals are not equally spaced. Thanks! David ______________________________________________ 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.