Boxplot in R

In this post I am going to show how to draw boxplot using R studio with existing data set. For this I am uisng sleep data set.

Boxplots

• are a perfect way to compare distributions of different groups
• allow a good overview: min, max, median,
• quartiles 1 and 3, outliers
• they often come together with ANOVA
• standard tool for scientific publications

sleepboxplot = boxplot(data = sleep, extra ~ group,
                        main = "Change in sleep duration",
                        col.main = "red", ylab="change in hrs", xlab="drug")

to include the mean to the boxplot we can use below script.

attach(sleep)
means = by(extra, group, mean)
points(means, col = "red")
horizontalboxplot = boxplot(data = sleep, extra ~ group, ylab="", xlab="", horizontal = T)

To view the Hirizental box plot with filling colors, we can use below syntax

horizontalboxplot = boxplot(data = sleep, extra ~ group, ylab="", xlab="", horizontal = T, col = c("blue", "red") )

Thank You !!!