Oppiskele Levels in Factors

Definition

Levels in a factor represent the set of distinct categories that the factor can take.

Viewing Levels

The levels() function shows all unique values stored in a factor.

Example


              12345
            
curr_f <- factor(c('USD', 'EUR', 'AUD', 'NOK', 
                   'CHF', 'EUR', 'AUD', 'EUR'))

# Display all levels
levels(curr_f)

Ordered Factors

In some cases, categories have a natural order (e.g., "short" < "medium" < "tall"). Factors can be declared as ordered by setting ordered = TRUE.

Example


              12345
            
sizes <- c('short', 'tall', 'medium',
           'medium', 'short', 'tall')

# Ordered factor (alphabetical order)
factor(sizes, ordered = TRUE)

Custom Ordering

By default, R orders levels in alphabetical order, which may not always match the intended hierarchy. You can define a specific order by passing a vector of levels in the desired sequence.

Example


              123456
            
sizes <- c('short', 'tall', 'medium',
           'medium', 'short', 'tall')
order <- c('short', 'medium', 'tall')

# Ordered factor (correct order)
factor(sizes, ordered = TRUE, levels = order)

This ensures the order matches your intended meaning.

Tehtävä

Swipe to start coding

You have a vector of grades ranging from 'A' to 'F'. You're tasked with converting this into an ordered factor with the sequence 'F < D < C < B < A':

Convert the grades vector to a factor, capturing the required order, and store it in the grades_f variable.
Display the entire grades_f variable.

Ratkaisu

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 1. Luku 23

single

Kysy tekoälyä

Kysy mitä tahansa tai kokeile jotakin ehdotetuista kysymyksistä aloittaaksesi keskustelumme

Pyyhkäise näyttääksesi valikon

Definition

Levels in a factor represent the set of distinct categories that the factor can take.

Viewing Levels

The levels() function shows all unique values stored in a factor.

Example


              12345
            
curr_f <- factor(c('USD', 'EUR', 'AUD', 'NOK', 
                   'CHF', 'EUR', 'AUD', 'EUR'))

# Display all levels
levels(curr_f)

Ordered Factors

In some cases, categories have a natural order (e.g., "short" < "medium" < "tall"). Factors can be declared as ordered by setting ordered = TRUE.

Example


              12345
            
sizes <- c('short', 'tall', 'medium',
           'medium', 'short', 'tall')

# Ordered factor (alphabetical order)
factor(sizes, ordered = TRUE)

Custom Ordering

By default, R orders levels in alphabetical order, which may not always match the intended hierarchy. You can define a specific order by passing a vector of levels in the desired sequence.

Example


              123456
            
sizes <- c('short', 'tall', 'medium',
           'medium', 'short', 'tall')
order <- c('short', 'medium', 'tall')

# Ordered factor (correct order)
factor(sizes, ordered = TRUE, levels = order)

This ensures the order matches your intended meaning.

Tehtävä

Swipe to start coding

You have a vector of grades ranging from 'A' to 'F'. You're tasked with converting this into an ordered factor with the sequence 'F < D < C < B < A':

Convert the grades vector to a factor, capturing the required order, and store it in the grades_f variable.
Display the entire grades_f variable.

Ratkaisu

Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoista

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 1. Luku 23

single