Histogram and density plots in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a histogram of the variable 'x' using ggplot2.

R Programming

library(ggplot2)
data <- data.frame(x = rnorm(100))
ggplot(data, aes(x = x)) + geom_[1]()

Drag options to blanks, or click blank then click option'

Ahist

Bpoint

Chistogram

Dbar

Attempts:

3 left

💡 Hint

Common Mistakes

Using geom_bar() instead of geom_histogram()

Using geom_point() which creates scatter plots

The correct function to create a histogram in ggplot2 is geom_histogram().

2fill in blank

medium

Complete the code to add a density plot layer on top of the histogram.

R Programming

ggplot(data, aes(x = x)) + geom_histogram(binwidth = 0.5, fill = 'blue', alpha = 0.5) + geom_[1](color = 'red')

Drag options to blanks, or click blank then click option'

Adensity

Bhist

Cline

Dsmooth

Attempts:

3 left

💡 Hint

Common Mistakes

Using geom_hist() again instead of geom_density()

Using geom_line() which requires y aesthetic

The function geom_density() adds a density plot layer.

3fill in blank

hard

Fix the error in the code to correctly plot a histogram with density on y-axis.

R Programming

ggplot(data, aes(x = x, y = ..[1]..)) + geom_histogram(binwidth = 0.3)

Drag options to blanks, or click blank then click option'

Avalue

Bdensity

Cfrequency

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using y = ..count.. which shows counts instead of density

Using y = ..value.. which is invalid

Using y = ..density.. scales the histogram to show density instead of counts.

4fill in blank

hard

Fill both blanks to create a histogram with density overlay and set transparency.

R Programming

ggplot(data, aes(x = x)) + geom_histogram(binwidth = 0.4, fill = 'green', alpha = [1]) + geom_[2](color = 'black', size = 1)

Drag options to blanks, or click blank then click option'

A0.3

B0.7

Cdensity

Dline

Attempts:

3 left

💡 Hint

Common Mistakes

Using alpha greater than 1 or less than 0

Using geom_line() instead of geom_density()

Alpha controls transparency; 0.7 is a good choice. geom_density() adds the density line.

5fill in blank

hard

Fill all three blanks to create a histogram with density overlay, set binwidth, and add title.

R Programming

ggplot(data, aes(x = x)) + geom_histogram(binwidth = [1], fill = 'purple', alpha = 0.6) + geom_density(color = [2], size = 1) + ggtitle([3])

Drag options to blanks, or click blank then click option'

A0.2

B'red'

C"Histogram with Density"

D0.5

Attempts:

3 left

💡 Hint

Common Mistakes

Not quoting the title string

Using invalid binwidth values

Binwidth 0.5 is reasonable. Color 'red' for density line. Title must be a string in quotes.