You want to keep only reviews that received at least one helpful vote. Which code does this correctly?

Question

BlackTom AI · Accepted Answer

filter() keeps rows for which a logical expression is TRUE, so pet_supplies |> filter(helpful_votes >= 1) will retain only reviews that have at least one helpful vote.

1) Relevant knowledge points and concepts:
- dplyr::filter() selects rows based on a logical condition; it returns a subset of the original data frame.
- dplyr::mutate() creates or transforms columns, returning the same number of rows (it does not remove rows).
- Comparison operators: >= 1 means “one or more”; > 1 means “strictly greater than one” (two or more).
- The base pipe |> (or %>%) passes the left-hand result into the function on the right.

2) Step-by-step reasoning:
- We want to keep rows where helpful_votes is at least 1, that is helpful_votes >= 1.
- Because we want to remove rows that do not meet the condition, we need a row-filtering verb: filter().
- Therefore the expression should be pet_supplies |> filter(helpful_votes >= 1).

3) Example with intermediate steps:
Given helpful_votes column values: [0, 1, 2]
- Evaluate helpful_votes >= 1 -> [FALSE, TRUE, TRUE]
- filter() keeps rows where the evaluation is TRUE -> rows with values 1 and 2 remain.

4) Why the correct answer is correct:
- It uses the correct comparison (>= 1) to include reviews with exactly one helpful vote.
- It uses filter(), so rows failing the condition are removed.

5) Why the other options are incorrect:
- pet_supplies |> filter(helpful_votes > 1): uses filter but > 1 excludes reviews with exactly one helpful vote (keeps only 2 or more).
- pet_supplies |> mutate(helpful_votes > 1): creates a new logical column (TRUE/FALSE) but does not remove rows.
- pet_supplies |> mutate(helpful_votes >= 1): same issue—adds a logical column indicating condition but does not subset the data.

6) Conclusion:
The correct code is pet_supplies |> filter(helpful_votes >= 1), which matches the provided answer.

You want to keep only reviews that received at least one helpful vote. Which code does this correctly?单项选择题

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True/False, you can filter on more than one column at a time

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