The parameter alpha in the R package ggplot2 is used to express the transparency of the fill colour of the function geom_
However for the function geom_rect it might not work as aspected.
In my latest work, I tried to combine different geom function but I was stuck when all was covered when I used geom_rect.
Let’s see an example:
If we plot the data using geom_jitter and geom_boxplot we obtain the plot:
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