Thank you Jim. brkdn.plot() seems to be just the function I need.
Still, I wonder if there are lists of labels of the different measures of central tendency (mct argument) and measures of dispersion (md)? dror ----------------------------- On Wed, Nov 4, 2009 at 7:41 AM, Jim Lemon <j...@bitwrit.com.au> wrote: > On 11/03/2009 10:15 PM, Dror D Lev wrote: >> >> Hello. >> >> I need to plot a two-way interaction (5 levels X 3) with error bars. >> The x.factor will be the five-levels var and the trace.factor will be >> the three level var. >> >> I was able to find functions that draw error bars, but still couldn't >> find a way to draw an interaction plot that looks like what is common >> in psychological (and related) journals: the lines (three in my need) >> are plotted in parallel and to avoid overlapping of the error bars a >> small jitter is added. >> >> I was able to make plotmeans() {from gplots} draw the interaction but >> with the lines plotted side by side (not parallel), resulting in three >> panes of one line each. When I tried manually super-imposing (looping >> a draw of one line for each level in the trace.factor) I got the >> overall look, but the error bars overlap and are hard to distinguish. >> >> Another attempt I made was with ci.plot() {from pda}. Inputting an >> aov() model resulted in a perfect plot of interaction but which is >> very limited to handle - I was unable to add a legend, change symbols >> etc. >> >> Does anybody knows if there is a way to manipulate either of the above >> functions more then what I was able to? >> Is there another function to draw interaction plots with error bars? >> >> > > Hi Dror, > I think you want to offset the points in a group along the x axis so that > the points and error bars don't overlap. Try introducing an x offset of > maybe 0.1 in your try with plotmeans. To see an example of what this looks > like and how it is done, have a look at brkdn.plot in the plotrix package. > > Jim > > ______________________________________________ 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.