Display Mean for Each Group in Point Chart using ggplot2 in R

To display mean for each group in point chart using ggplot2 in R, we can follow the below steps −

• First of all, create a data frame.

• Then, use geom_point and geom_summary functions and provide mean for fun argument with different size and shape of the point for mean display.

Example

Create the data frame

Let’s create a data frame as shown below −

grp<-sample(LETTERS[1:5],25,replace=TRUE)
dv<-sample(1:50,25)
df<-data.frame(grp,dv)
df

Output

On executing, the above script generates the below output(this output will vary on your system due to randomization) −

  grp dv
1  E  25
2  E  29
3  E  24
4  E  45
5  B  48
6  A  17
7  C  22
8  D   6
9  A  10
10 E  34
11 A  19
12 C  30
13 B  36
14 E  28
15 D  38
16 E  32
17 E  39
18 A  43
19 B   7
20 C   2
21 D   4
22 D   3
23 A  46
24 D  16
25 A  47

Display mean for each group in point chart using ggplot2

Using geom_point and geom_summary functions and provide mean for fun argument with different size and shape of the point for mean display for the data stored in data frame df as shown below −

grp<-sample(LETTERS[1:5],25,replace=TRUE)
dv<-sample(1:50,25)
df<-data.frame(grp,dv)
library(ggplot2)

ggplot(df,aes(grp,dv))+geom_point()+stat_summary(geom="point",fun="mean",shape=24,fill="blue",size=4)

Output