Created
November 14, 2017 15:54
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# Function to add number ontop of geom_boxplot | |
library(ggplot2) | |
library(dplyr) | |
# /!\ Need to manually change the "groups" if ks_test included | |
add_groups_and_number = function(given_plot, ks_tests) { | |
y_range = ggplot_build(given_plot)$layout$panel_params[[1]]$y.range | |
y_upper = max(y_range) | |
# Compute table with groups from Kruskal-Wallis test | |
group_df = ks_tests$groups %>% | |
tibble::rownames_to_column("cyl") %>% | |
select(cyl, groups) %>% | |
mutate(y = y_upper) | |
group_df$cyl = factor(trimws(group_df$cyl)) | |
# Function to return number of observation | |
give_n = function(x, y_up = y_upper) { | |
data.frame(y = y_up*1.06, | |
label = paste("n =", length(x)) | |
) | |
} | |
new_plot = given_plot + | |
# Kruskal-Wallis group | |
geom_text(data = group_df, aes(x = cyl, y = y, label = groups, | |
fill = NULL), | |
color = "black", size = rel(5)) + | |
# Give back only length of data | |
stat_summary(fun.data = give_n, aes(x = as.factor(cyl)), geom = "text") | |
return(new_plot) | |
} | |
plot_cyl_mpg = ggplot(mtcars, aes(x = as.factor(cyl), mpg)) + | |
geom_boxplot() | |
ks_test = agricolae::kruskal(mtcars$mpg, trt = as.factor(mtcars$cyl)) |
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