Is there a way to plot a value calculated with a mathematical formula?

Question

Let's imagine I have this command

library(ggpubr)
ggboxplot(ToothGrowth, x = "supp", y = "len",
          color = "supp", palette = "jco",
          add = "jitter")
p + stat_compare_means(method = "t.test")

I would like to plot y values as a calculated value: 2^len and to leave compare means on len original values.

Any help?

Answer 1

Not sure whether I got you right but you can add a new column with the calculated value to your data, use this new var inside ggboxplot, while passing the orginal variable to stat_compare_means via the mapping :

library(ggpubr)
#> Loading required package: ggplot2
ToothGrowth$len2 <- 2^ToothGrowth$len
ggboxplot(ToothGrowth, x = "supp", y = "len2",
          color = "supp", palette = "jco",
          add = "jitter") +
  stat_compare_means(aes(x = supp, y = len, color = supp), method = "t.test")

Answer 2

Thank you, Stefan, that's indeed what I needed.

An additional question, if you consider this code

ggbarplot(ToothGrowth, x = "dose", y = "len", add = "mean_se",
          color = "supp", palette = "jco", 
          position = position_dodge(0.8))+
  stat_compare_means(aes(group = supp), label = "p.signif", label.y = 29)

I would like to compare both "supp" groups with the same reference group (i.e. "0.5"), as to have a distinct p.signif label on each bar.

Any suggestion?