ggplo2 sample size annotation: How do you place the sample size under the x-axis?

Question

I tried with the "solutions" from other posts without success. So, I am trying to add to my ggplot2 barplot the sample size per group under the names at the x-axis. I am using the stat_n_text(), but it does not allow you to change the position outside the chart. Does anyone know how to do this, or is there any other approach to adding the sample size per group?

Here is my code and my output.

ggplot(data, aes(group, pm_l, fill=condition)) + theme_classic() +
  geom_bar(position = position_dodge(), stat = "identity") + 
  facet_wrap(~parameter, scales = "free") +
  ylab("pm_l") +
  scale_fill_brewer(palette = "Paired") +
  stat_n_text(y.pos = 0)

I want the n=X to be named MICRO and ONE in each plot.

Any help or suggestions are highly appreciated!!!!

Provide a sample of your data, using `dput(data)` – shafee Jul 12 '22 at 16:58 — shafee, Jul 12 '22 at 16:58

score 0 · Answer 1 · answered Jul 12 '22 at 20:12

Maybe you can try something like this. As we don't have the data, this is just an example:

library(ggplot2)

df <- data.frame(ColA = c("MICRO","MICRO","MICRO","ONE","ONE","ONE"),
               ColB = c(6,-5,9,-2,2,-1),
               group = c("FLUX","ROXn","ROXn","FLUX","ROXn","ROXn"),
               condition = c("PRE","POST","PRE","POST","PRE","POST"))

ggplot(df,aes(ColA,ColB,fill = condition, color = condition)) + 
  geom_bar(stat="identity") +
  facet_wrap(~group) +
  theme_minimal() +
  ylab("pm_l") +
  xlab("group") +
  scale_fill_brewer(palette = "Paired")

OUTPUT:

ggplo2 sample size annotation: How do you place the sample size under the x-axis?

1 Answers1