[R] Overlaying two graphs using ggplot2 in R

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Tue Jan 28 09:20:40 CET 2014

Dear Kristi,

You could do something like this.

ggplot(dat1, aes(x = factor(site), y = Present)) +
  geom_boxplot(aes(colour = layer)) +
  geom_line(data = dat2, aes(group = 1, y = present)) +
  geom_point(data = dat2, aes(y = present))

Note that
- ggplot provides no second axis
- the boxplots display the median, not the mean

Best regards,

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
+ 32 2 525 02 51
+ 32 54 43 61 85
Thierry.Onkelinx at inbo.be

To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] Namens Kristi Glover
Verzonden: maandag 27 januari 2014 12:13
Aan: R-help
Onderwerp: [R] Overlaying two graphs using ggplot2 in R

Hi R Users,
I was struggling to overlay two graphs created from the two different dataset using ggplot2. Furthermore, I could not join means of the box plots.

I tried this way but did not work. Any suggestions?
dat1<-structure(list(site = c(1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 3L, 3L), layer = structure(c(2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 1L, 1L), .Label = c("bottom", "top"), class = "factor"), Present = c(120L, 125L, 123L, 23L, 21L, 19L, 131L, 124L, 127L, 24L, 27L, 25L, 145L, 143L, 184L, 29L, 14L, 17L, 38L)), .Names = c("site", "layer", "Present"), row.names = c(NA, 19L), class = "data.frame")
dat2<-structure(list(site = 1:3, present = c(-3L, 2L, 5L)), .Names = c("site", "present"), row.names = c(NA, 3L), class = "data.frame")
A<-ggplot(dat1, aes(x = factor(site), y = Present, colour = layer, fill=layer)) +
    geom_boxplot(outlier.shape = 16, outlier.size = 1)  + theme_bw()+ ylim(0,185) # Here I wanted to join the means of the boxplots among the sites, but I could not join it.
B<-ggplot(dat2, aes(x=factor(site),y= present, colour="blue") +
     geom_line() + geom_point()) # wanted to plot it using second y axis.
Thanks for your help.

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