r - adding geom_hline+ Sample Size to a boxplot -


using ggplot, trying

  1. add horizontal line boxplot
  2. add sample size x axis.

i have following dataset:

site, aluminum_dissolved, federal_guideline m1, 0.1, 0.4 m1, 0.2, 0.4 m1, 0.5, 0.4 m2, 0.6, 0.4 m2, 0.4, 0.4 m2, 0.3, 0.4

adding horizontal line

#make boxplot horizontal error bars ggplot(exampledata, aes(x = site,y = aluminum_dissolved))+     stat_boxplot(geom='errorbar', linetype=1)+     geom_boxplot(fill="pink")  #now want add guideline value @ 0.4 corresponding "federal guideline" in legend, tried: geom_hline(0.4)

and following error:

error in get(x, envir = this, inherits = inh)(this, ...) : mapping should list of unevaluated mappings created aes or aes_string

i tried adding data in string i.e., geom_hline("exampledata$federal_guideline) same error above.

adding sample size (n= x axis):

finally, want add n label of x-axis (i.e., m2 (n=3)). able in regular r, following code: names=paste(b$names, "(n=", b$n,")")), b=boxplot function, can't figure out how in ggplot2

you need explicitly name arguments in geom_hline, otherwise doesn't know 0.4 referring.

so

ggplot(exampledata, aes(x = site,y = aluminum_dissolved))+     stat_boxplot(geom='errorbar', linetype=1)+     geom_boxplot(fill="pink") +     geom_hline(yintercept = 0.4)

will produce required horizontal line.

to change labels on x-axis, use scale_x_discrete change labels

you can precompute these using like

library(plyr) xlabels <- ddply(exampledata, .(site), summarize,                   xlabels = paste(unique(site), '\n(n = ', length(site),')'))  ggplot(exampledata, aes(x = site,y = aluminum_dissolved))+      stat_boxplot(geom='errorbar', linetype=1)+      geom_boxplot(fill="pink") + geom_hline(yintercept = 0.4) +        scale_x_discrete(labels = xlabels[['xlabels']])

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