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R for Data Analytics MCQ - Data Manipulation with R

21 Which merge() argument controls whether unmatched rows from both data frames are retained?

merge(..., all = TRUE) performs a full outer join and retains unmatched rows from both inputs.

22 What does merge(x, y, all.x = TRUE) most closely represent?

all.x = TRUE retains every row from x and matching rows from y.

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lapply and sapply

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Question:

Which function combines objects side by side as columns?

A. rbind()
B. cbind()
C. merge.rows()
D. stackrows()

Correct answer: B

Explanation:

cbind() combines objects by columns.

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