Connect Mean Points of Error Bars in ggplot2 Plot in R (Example Code)

This post illustrates how to draw a graphic where the mean points of error bars are connected in the R programming language.

Creation of Example Data

my_df <- data.frame(group = LETTERS[1:4],    # Constructing example data
                    estimate = c(1, 5, 3, 3))
my_df$low_CI <- my_df$estimate - 0.2         # Make up confidence intervals
my_df$upp_CI <- my_df$estimate + 0.2
my_df                                        # Display example data in RStudio console
#   group estimate low_CI upp_CI
# 1     A        1    0.8    1.2
# 2     B        5    4.8    5.2
# 3     C        3    2.8    3.2
# 4     D        3    2.8    3.2

Example: Drawing Error Bars with Connected Points Using ggplot2 Package

install.packages("ggplot2")                  # Install & load ggplot2 package
library("ggplot2")
my_plot <- ggplot(my_df,                     # ggplot2 plot with error bars and connecting lines
                  aes(x = group, 
                      y = estimate,
                      col = group, 
                      group = 1)) +
  geom_errorbar(aes(ymin = low_CI,
                    ymax = upp_CI)) +
  geom_line(aes(x = 1:nrow(my_df),
                y = estimate)) + 
  geom_point()
my_plot

r graph figure 1 connect mean points error bars ggplot2 r

Further Resources & Related Tutorials

Please find some related R programming tutorials on topics such as descriptive statistics and lines in the following list.

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