Exam DISC-DA Practice Question 10

Study guide: Exam DISC-DA

An analyst works with a dataframe of 25,000 claims in R. Which dplyr step changes the number of columns but never the number of rows?

• A) filter(), keeping the claims above a threshold
• B) mutate(), adding a severity band derived from the paid amount
• C) arrange(), sorting the claims by paid amount
• D) summarize() after group_by(), totalling paid by state

Answer this question and see the worked solution

Concepts tested

• Dataframe

More questions from this set

• Exam DISC-DA Practice Question 9
• Exam DISC-DA Practice Question 11