On 7/25/07, Ben Bolker <[EMAIL PROTECTED]> wrote: > John Zabroski <johnzabroski <at> gmail.com> writes: > > > The best clue I have so far is Rtips #5.9: > > http://pj.freefaculty.org/R/Rtips.html#5.9 which is what I based my present > > solution off of. > > > > However, I do not understand how this works. It seems like there is no > > concrete way to determine the arrow drawing parameters x0 and x1 for a > > barplot. Moreover, the bars seem to be "cut off". > > > > barplot() returns the x values you need for x0 and x1. > barplot(...,ylim=c(0,xbar+se)) will set the upper y limit so > the bars don't get cut off. > > P.S. I hope you're not hoping to infer a statistically > significant difference among these groups ... > > cheers > Ben Bolker
Thanks a lot! I tried all three and they all seem very dependable. Also, I appreciate you rewriting my solution and adding elegance. Is there a way to extend the tick marks to the ylim values, such that the yscale ymax tickmark is something like max(xbar+se)? In the documentation, I thought par(yaxp=c(y0,y1,n)) would do the trick, but after trying to use it I am not sure I understand what yaxp even does. P.S. I am not looking for statistically significant differences. I am trying to learn how to leverage R's graphing capabilities. I also appreciate Frank Harrell referring me to the link about Dynamite Plots and associated weaknesses. ______________________________________________ R-help@stat.math.ethz.ch 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.