Factor levels in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a factor from the vector colors.

R Programming

colors <- c("red", "blue", "green", "blue")
factor_colors <- factor([1])

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

Alevels

Bc

Cfactor

Dcolors

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the function name factor instead of the vector.

Passing levels which is not a vector.

The factor() function converts a vector into a factor. You need to pass the vector colors as the argument.

2fill in blank

medium

Complete the code to get the levels of the factor f.

R Programming

f <- factor(c("small", "medium", "large", "medium"))
levels_list <- [1](f)

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

Afactor

Blevels

Cclass

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using class() which returns the object type, not levels.

Using length() which returns the number of elements.

The levels() function returns the levels of a factor in R.

3fill in blank

hard

Fix the error in the code to set the levels of factor f to "low", "medium", "high".

R Programming

f <- factor(c("medium", "low", "high"))
levels(f) <- [1]

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

Ac("low", "medium", "high")

B["low", "medium", "high"]

Clist("low", "medium", "high")

Dc('low', 'medium')

Attempts:

3 left

💡 Hint

Common Mistakes

Using square brackets which are not valid for vectors in R.

Using list() which is not the correct type for levels.

To set levels, you must assign a character vector using c() with all desired levels.

4fill in blank

hard

Fill both blanks to create a factor f with levels "small", "medium", "large" and then get its levels.

R Programming

f <- factor(c("medium", "small", "large"), levels = [1])
result <- [2](f)

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

Ac("small", "medium", "large")

Blevels

Cfactor

Dc("large", "medium", "small")

Attempts:

3 left

💡 Hint

Common Mistakes

Using factor instead of levels to get levels.

Setting levels in wrong order or with wrong function.

You set the levels explicitly with c() and then use levels() to get them.

5fill in blank

hard

Fill all three blanks to create a factor f from sizes, set levels to "S", "M", "L", and check if "XL" is a level.

R Programming

sizes <- c("M", "S", "L", "M")
f <- factor(sizes, levels = [1])
levels_list <- [2](f)
has_xl <- [3] %in% levels_list

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

Ac("S", "M", "L")

Blevels

C"XL"

Dfactor

Attempts:

3 left

💡 Hint

Common Mistakes

Using factor instead of levels to get levels.

Checking membership with wrong variable or string.

Set levels with c(), get levels with levels(), and check membership with "XL" %in% levels_list.