Reconstruct ggplot2 boxplots given dataframe with relevant columns

Question

I am wondering what is the idiomatic approach for constructing a ggplot2 boxplot given precomputated values for each boxplot

> df
    base p10 p90 lower_quartile     mean median upper_quartile
1      1  32  35             33 33.63740     34             34
2      2  32  35             33 33.77753     34             35
3      3  32  36             33 33.89361     34             35
4      4  33  36             33 33.89691     34             35
5      5  32  35             33 33.85145     34             35
6      6  35  37             37 36.48259     37             37

Attempting to draw these plots with

ggplot(df, aes(base)) +
  geom_boxplot(aes(ymin = p10,
                   lower = lower_quartile,
                   middle = median,
                   upper = upper_quartile,
                   ymax = p90),
               stat = "identity")

does not give the desired plots. What am I missing?

LyzandeR · Accepted Answer · 2015-09-28 00:02:54Z

2

I don't know what base represents in your data.frame but in order to do it correctly your x-axis is supposed to be discrete (to show the different boxplots). Then for the y axis you need a ymin, a lower, a middle, an upper and a ymax which you have provided. The x-axis is the variable that is used to plot the different boxplots. So, if you turn it into a factor then it works:

library(ggplot2)
#I have added base as factor
ggplot(df, aes(factor(base))) +
  geom_boxplot(aes(ymin = p10,
                   lower = lower_quartile,
                   middle = median,
                   upper = upper_quartile,
                   ymax = p90),
               stat = "identity")

Output:

And this way it works.

answered Sep 28, 2015 at 0:02

LyzandeR

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