I am new to R. I want to graph group data using a "Traditional Bar Chart with Standard Error Bar", like the kind shown here: http://samiam.colorado.edu/~mcclella/ftep/twoGroups/twoGroupGraphs.html
Is there a simple way to do this? So far, I have only figured out how to plot the bars using barplot. testdata <- scan(, list(group=0,xbar=0,se=0)) 400 0.36038 0.02154 200 0.35927 0.02167 100 0.35925 0.02341 50 0.35712 0.01968 25 0.35396 0.01931 barplot(testdata$xbar, names.arg=as.character(testdata$group), main="a=4.0", xlab="Group", ylab="xbar") xvalues <- c(0.7, 1.9, 3.1, 4.3, 5.5) arrows(xvalues, testdata$xbar, xvalues, testdata$xbar+testdata$se, length= 0.4, angle=90, code=3) 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". [[alternative HTML version deleted]] ______________________________________________ [email protected] 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.
