[R] ggplot2 error bars and convex hulls

Ivan Calandra c@|@ndr@ @end|ng |rom rgzm@de
Wed Apr 22 08:38:44 CEST 2020

Thanks Rui for these 2 possibilities; I'll have a look.

Any one with pointers for the error bars issue?


Dr. Ivan Calandra
TraCEr, laboratory for Traceology and Controlled Experiments
MONREPOS Archaeological Research Centre and
Museum for Human Behavioural Evolution
Schloss Monrepos
56567 Neuwied, Germany
+49 (0) 2631 9772-243

On 21/04/2020 19:06, Rui Barradas wrote:
> Hello,
> As for convex hulls, there is an example of how to construct a
> stat_hull in
> vignette("extending-ggplot2", package = "ggplot2")
> There is also a geom_hull in a GitHub package:
> devtools::install_github("cmartin/ggConvexHull")
> Hope this helps,
> Rui Barradas
> Às 17:02 de 21/04/20, Ivan Calandra escreveu:
>> Dear useRs,
>> I would like to have horizontal and vertical error bars extending from
>> the means on two continuous variables.
>> This would be the "manual" way of doing it, computing the mean and sd
>> (or whatever stats) beforehand and then calling geom_errorbar() and
>> geom_errorbarh() with appropriate coordinates:
>> https://stackoverflow.com/questions/12570816/ggplot-scatter-plot-of-two-groups-with-superimposed-means-with-x-and-y-error-bar
>> But I am a bit surprised that there is no "built-in" way of doing it
>> with ggplot2. I mean not having to compute mean and sd beforehand and
>> not having to call both geom_errorbar() and geom_errorbarh() with a new
>> set of aesthetics.
>> In the same idea, I am looking at convex hulls and I was also expecting
>> to have a built-in way to do this in ggplot2. But I have only found this
>> "manual" way:
>> https://stats.stackexchange.com/questions/22805/how-to-draw-neat-polygons-around-scatterplot-regions-in-ggplot2
>> Thank you in advance for any pointer.
>> Ivan

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