Box plots and violin plots in R Programming - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a box plot used for in data visualization?

A box plot shows the distribution of data by displaying the median, quartiles, and possible outliers. It helps to understand the spread and skewness of the data.

intermediate

What extra information does a violin plot provide compared to a box plot?

A violin plot shows the data distribution's density shape along with the summary statistics like median and quartiles, giving a fuller picture of the data spread.

beginner

In R, which package is commonly used to create box plots and violin plots?

The ggplot2 package is commonly used in R to create both box plots and violin plots with easy and flexible syntax.

beginner

What does the 'geom_boxplot()' function do in ggplot2?

The 'geom_boxplot()' function adds a box plot layer to a ggplot, showing median, quartiles, and outliers of the data.

beginner

How do you add a violin plot layer in ggplot2?

You add a violin plot layer using the 'geom_violin()' function, which shows the data distribution shape along with summary statistics.

What does the thick line inside a box plot represent?

A The mean of the data

B The median of the data

C The maximum value

D The minimum value

The thick line inside a box plot shows the median, which is the middle value of the data.

Which R function adds a violin plot layer in ggplot2?

A geom_boxplot()

B geom_density()

C geom_violin()

D geom_histogram()

The 'geom_violin()' function adds a violin plot layer showing data distribution shape.

What does a violin plot show that a box plot does not?

A Data density distribution

B Quartiles

C Outliers

D Median value

Violin plots show the density distribution of the data, which box plots do not.

In a box plot, what do the 'whiskers' represent?

A The range of the data excluding outliers

B The mean and median

C The density of the data

D The mode of the data

Whiskers extend to the smallest and largest values within 1.5 times the interquartile range, excluding outliers.

Which package must you load to use 'geom_boxplot()' and 'geom_violin()' in R?

A shiny

B dplyr

C tidyr

D ggplot2

The ggplot2 package provides 'geom_boxplot()' and 'geom_violin()' functions.

Explain the differences and similarities between box plots and violin plots.

Think about what each plot shows about the data shape and summary.

Describe how to create a box plot and a violin plot in R using ggplot2.

Focus on the functions and steps needed in ggplot2.