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The _________ function is used to generate summary statistics from the data frame within strata defined by a variable.

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The _________ function is used to generate summary statistics from the data frame within strata defined by a variable. (a) groupby() (b) group() (c) group_by() (d) arrange This question was posed to me in a national level competition. The origin of the question is dplyr topic in portion R – Data Storage, Formats, Objects and Operations of R Programming Select the correct answer from above options

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The correct option is (c) group_by() Easiest explanation: The general operation here is a combination of splitting a data frame into separate pieces defined by a variable or group of variables (group_by()), and then applying a summary function across those subsets (summarize()).

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