Add Standard Error Bars to Barchart (2 Examples) | Draw Barplot in Base R & ggplot2 | stat_summary()

Published: 04 July 2022
on channel: Statistics Globe

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How to create a barplot with standard error (SE) bars in the R programming language. More details: https://statisticsglobe.com/add-stand...
R code of this video:

set.seed(37924) # Create example data frame
data ＜- data.frame(values = rnorm(100, 2),
group = letters[1:4])

data_summary ＜- aggregate(values ~ group, data, # Create summary data
function(x) c(mean = mean(x),
se = sd(x) / sqrt(length(x))))
data_summary ＜- data.frame(group = data_summary[ , 1], data_summary$values)
data_summary # Print summary data

base_r_barplot ＜- barplot(data_summary$mean ~ group, # Draw and store Base R barplot
data_summary,
ylim = c(0, 2.7))
arrows(x0 = base_r_barplot, # Add error bars
y0 = data_summary$mean + data_summary$se,
y1 = data_summary$mean - data_summary$se,
angle = 90,
code = 3,
length = 0.1)

install.packages("ggplot2") # Install & load ggplot2 package
library("ggplot2")

ggplot(data, aes(values, group, fill = group)) + # ggplot2 barplot with error bars
coord_flip() +
stat_summary(geom = "bar", fun = mean, position = "dodge") +
stat_summary(geom = "errorbar", fun.data = mean_se, position = "dodge")

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