arrange() for sorting in R Programming - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the arrange() function do in R?

The arrange() function sorts rows of a data frame or tibble by one or more columns in ascending order by default.

beginner

How do you sort a data frame by a column descending using arrange()?

Use the desc() function inside arrange() like this: arrange(data, desc(column_name)).

beginner

What package do you need to use arrange()?

You need the dplyr package, which is part of the tidyverse collection.

intermediate

How can you sort by multiple columns using arrange()?

List the columns in order inside arrange(), like arrange(data, col1, col2). It sorts by col1 first, then col2 to break ties.

advanced

What happens if you use arrange() on a grouped tibble?

arrange() sorts the entire data frame ignoring groups unless you use group_by() with arrange() carefully or use slice_min() or slice_max() for group-wise sorting.

What is the default sorting order of arrange() in R?

A No sorting

B Descending

C Ascending

D Random

arrange() sorts data in ascending order by default.

Which package provides the arrange() function?

A dplyr

B ggplot2

C base

D tidyr

arrange() is part of the dplyr package.

How do you sort a data frame by column age in descending order?

A sort(data$age, decreasing = TRUE)

B arrange(data, age)

C arrange(data, -age)

D arrange(data, desc(age))

Use desc() inside arrange() to sort descending.

What happens if you use arrange() with multiple columns?

A Sorts by the first column, then second to break ties

B Sorts only by the last column

C Sorts randomly

D Throws an error

arrange() sorts by columns in the order listed.

Which function is used inside arrange() to sort descending?

A reverse()

B desc()

C decreasing()

D order()

desc() tells arrange() to sort descending.

Explain how to use arrange() to sort a data frame by one or more columns in R.

Think about how you tell R which columns to sort by and how to change the order.

Describe what package you need and how arrange() behaves with grouped data.

Remember tidyverse and grouping concepts.