Releveling factors in R Programming - Mini Project: Build & Apply

Releveling Factors in R

📖 Scenario: Imagine you have survey data where people's favorite fruits are recorded as categories. You want to change the order of these categories to make "Banana" the first choice for analysis.

🎯 Goal: You will create a factor variable with fruit names, then relevel it so that "Banana" is the first level.

📋 What You'll Learn

Create a factor variable called fruits with the values: "Apple", "Banana", "Cherry", "Date", "Banana"

Create a variable called new_first_level and set it to "Banana"

Use the relevel() function to create a new factor called fruits_releveled with new_first_level as the first level

Print the levels of fruits_releveled to show the new order

💡 Why This Matters

🌍 Real World

Releveling factors is useful when you want to change the reference category in surveys, experiments, or any categorical data analysis.

💼 Career

Data analysts and statisticians often need to reorder factor levels to control how models interpret categorical variables or how plots display categories.

1

Create the factor variable

Create a factor variable called fruits with these exact values in order: "Apple", "Banana", "Cherry", "Date", "Banana"

R Programming

# Create the factor variable fruits with the specified values
# Your code here

Need a hint?

Use the factor() function with a vector of fruit names.

2

Set the new first level

Create a variable called new_first_level and set it to the string "Banana"

R Programming

fruits <- factor(c("Apple", "Banana", "Cherry", "Date", "Banana"))
# Create new_first_level variable and assign "Banana"
# Your code here

Need a hint?

Just assign the string "Banana" to the variable new_first_level.

3

Relevel the factor

Use the relevel() function to create a new factor called fruits_releveled by releveling fruits with the first level set to new_first_level

R Programming

fruits <- factor(c("Apple", "Banana", "Cherry", "Date", "Banana"))
new_first_level <- "Banana"
# Create fruits_releveled by releveling fruits with new_first_level
# Your code here

Need a hint?

Use relevel(fruits, ref = new_first_level) to change the first level.

4

Print the new levels

Print the levels of fruits_releveled using the levels() function

R Programming

fruits <- factor(c("Apple", "Banana", "Cherry", "Date", "Banana"))
new_first_level <- "Banana"
fruits_releveled <- relevel(fruits, ref = new_first_level)
# Print the levels of fruits_releveled
# Your code here

Need a hint?

Use print(levels(fruits_releveled)) to see the new order of levels.