Reduce range ggplot y-axis without reducing range of shown data

Question

I would like to restrict the end of the y-axis without restricting the range of the shown data in this plot on the y-axis from 0 to 32. Specifically, the axis should not be shown for higher values but the significance comparison should be included and the part in red should not be shown.

library(ggpubr)
data("ToothGrowth")
head(ToothGrowth)

# Visualize: Specify the comparisons you want
my_comparisons <- list( c("0.5", "1"), c("1", "2"), c("0.5", "2") )
ggboxplot(ToothGrowth, x = "dose", y = "len",
      color = "dose", palette = "jco")+ 
  stat_compare_means(comparisons = my_comparisons)+ # Add pairwise comparisons p-value
  stat_compare_means(label.y = 50)     # Add global p-value

score 3 · Answer 1 · answered Sep 24 '21 at 09:24

You may try below solution. It limits the y-axis to 35, then tells ggplot to not 'clip' the rest of the data, and to show the annotations that are outside the range of c(0,35), we expand the margins of the plot. Then re-position the legend to your needs. Modify according to your needs:

library(ggpubr)
data("ToothGrowth")
head(ToothGrowth)

# Visualize: Specify the comparisons you want
my_comparisons <- list( c("0.5", "1"), c("1", "2"), c("0.5", "2") )
ggboxplot(ToothGrowth, x = "dose", y = "len",
          color = "dose", palette = "jco")+ 
  stat_compare_means(comparisons = my_comparisons)+ # Add pairwise comparisons p-value
  stat_compare_means(label.y = 50) +
  coord_cartesian(clip = "off", ylim = c(0, 35)) +
  theme(plot.margin = unit(c(8,0,0,0), "cm"),
        legend.position = c(.5,1.5),
        legend.direction = "horizontal")

score 3 · Answer 2 · answered Sep 24 '21 at 09:43

You can try guide_axis_truncated() from the ggh4x package. Disclaimer: I'm the author of ggh4x.

library(ggpubr)
#> Warning: package 'ggpubr' was built under R version 4.1.1
#> Loading required package: ggplot2
data("ToothGrowth")
library(ggh4x)

# Visualize: Specify the comparisons you want
my_comparisons <- list( c("0.5", "1"), c("1", "2"), c("0.5", "2") )
ggboxplot(ToothGrowth, x = "dose", y = "len",
          color = "dose", palette = "jco")+ 
  stat_compare_means(comparisons = my_comparisons)+ # Add pairwise comparisons p-value
  stat_compare_means(label.y = 50) +
  scale_y_continuous(
    breaks = function(x) {
      x <- scales::extended_breaks()(x)
      x[x < 32]
    },
    guide = guide_axis_truncated(trunc_lower = -Inf, trunc_upper = 32)
  )
#> Warning in wilcox.test.default(c(4.2, 11.5, 7.3, 5.8, 6.4, 10, 11.2, 11.2, :
#> cannot compute exact p-value with ties
#> Warning in wilcox.test.default(c(4.2, 11.5, 7.3, 5.8, 6.4, 10, 11.2, 11.2, :
#> cannot compute exact p-value with ties
#> Warning in wilcox.test.default(c(16.5, 16.5, 15.2, 17.3, 22.5, 17.3, 13.6, :
#> cannot compute exact p-value with ties

^{Created on 2021-09-24 by the reprex package (v2.0.1)}

`ggh4x` - such a treasure trove. Thanks for your great work! — Henrik, Sep 24 '21 at 11:22

score 2 · Answer 3 · answered Sep 24 '21 at 09:16

Well, I tried. And it's not perfect - but it is a start ;)

library(ggpubr)
data("ToothGrowth")
head(ToothGrowth)

# Visualize: Specify the comparisons you want
my_comparisons <- list( c("0.5", "1"), c("1", "2"), c("0.5", "2") )
ggboxplot(ToothGrowth, x = "dose", y = "len",
          color = "dose", palette = "jco")+ 
  scale_y_continuous(breaks = c(10,20,30), limits = c(0,50)) +
  theme(axis.line.y = element_line(size = 1, colour = "white"))+
  stat_compare_means(comparisons = my_comparisons)+ # Add pairwise comparisons p-value
  stat_compare_means(label.y = 50, label.x = 0.3)+     # Add global p-value
  geom_rect(aes(xmin=0,xmax=0.02,ymin=0,ymax=30), size=0, fill="black")

Reduce range ggplot y-axis without reducing range of shown data

3 Answers3

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