On 02/13/2012 09:51 AM, Colin Wahl wrote:
Does anyone have any recommendations for producing dotplots with error
bars? Are there packages available for this? I searched far and wide
and cannot find a suitable option.
I am trying to produce publication-quality figures for my thesis
results. Dotplots (Cleveland dotplots) are a much better form of
summarizing barchart-type data. It does not appear that any of the
main plotting packages in r support dotplots with error bars.
Considering the benefit of these plots, I find it difficult to believe
that they have not been fully integrated into R.
I did find a function "dotplots.errors" available here:
http://agrobiol.sggw.waw.pl/~cbcs/articles/CBCS_5_2_2.pdf.
However, I have found this function absurdly difficult to use when
customizing figures (ordering displays properly, or just simple
getting the function to work.)
I've been struggling for the last few hours to figure out the error:
"error using packet 1 sum not meaningful for factors." Unlike other
packages, this function doesnt have a ?dotplots.errors to help guide
troubleshooting. I presume this is a technicality due to the a numeric
variable being identified as a factor. However, I've double checked
that all the numeric columns in the data frame are not factors, and
the error persists.
I'd really prefer not just calling it quits and resorting to
old-school sloppy bar charts, but if thats what I need to do to finish
this in a timely manner, then so be it.
Hi Colin,
I am grateful that Marcin Kozak gave plotrix a plug in the paper, and to
show my gratitude, I'll explain how to use centipede.plot to get the
illustration in the paper. Assume that you have the data frame shown on
p70 of the paper:
plant_height<-read.csv("plant_height.csv")
Now, to echo Marcin, let us produce the plot:
library(plotrix)
centipede.plot(t(plant_height[,c(3,2,4)]),
left.labels=plant_height$group,bg="black",
right.labels=rep("",13),xlab="Mean plant height (cm) +- SE")
If you want the mean value line:
abline(v=mean(plant_height$est),col="lightgray")
The grid lines are a bit more difficult. You could insert a line into
the function just after the call to box() to draw grid lines under each dot:
abline(h=1:dim(x)[2],col="lightgray",lty=2)
However, this looks like such a good idea that I will add two arguments
to the function to do the vertical line(s) and horizontal grid
automatically, and this option will appear in the next version of plotrix.
Jim
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