Preserve Width & Position of Single ggplot2 Boxplot in R (2 Examples) | position_dodge() Function

R code of this video:

subgroup = letters[1:2],
value = rnorm(90))
data$subgroup[data$group == "A" & data$subgroup == "b"] ＜- "a"

library("ggplot2") # Load ggplot2

ggplot(data, # Default ggplot2 boxplot
aes(x = group,
y = value,
fill = subgroup)) +
geom_boxplot()

ggplot(data, # Using position_dodge2 function
aes(x = group,
y = value,
fill = subgroup)) +
geom_boxplot(position = position_dodge2(preserve = "single"))

ggplot(data, # Using position_dodge function
aes(x = group,
y = value,
fill = subgroup)) +
geom_boxplot(position = position_dodge(preserve = "single"))

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[mrhsabari]

Thank you very much Joachim, your videos are an immense help!

[vallepereira]

Hello Joachim, Thaks for the time and effor you put into making these videos. It makes life very easy for most entry level R programmers.

I have a question: what does the fill argument inside ggplot(aes(fill = subgroup)) do ? I see that it adds a legend and helps in categoring the variables by colour, but I also see that it doesnt work for Barplots and some other kind of plots

[sanderwessels]

Hey, i am encountering the same problem and while preserve = single helps a lot there is also an issue that seems much more difficult to solve. the preserve = single automatically aligns your bars to the left. If in your case a red bar would be missing it would also align the sole blue bar to the left, something you don't like to see. Now doing this in position_dodge2() it will align all your bars centrally which is a small work around but not perfect. Do you have any ideas on solving those specific cases?
Otherwise great explanation. Keep up the good work!

[tchistermorrelebissa]

I do not know why mine is appear flat lines instead of boxes?

[tchistermorrelebissa]

Could we see the data from Excel till imported?

[tchistermorrelebissa]

Is ggplot a kind of software? R incorported ggplot2?