Which function can be used when a vector needs to be split into groups defined by a classifying factor, compute a function on the subsets, and return the results?

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Which function can be used when a vector needs to be split into groups defined by a classifying factor, compute a function on the subsets, and return the results?

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Which function can be used when a vector needs to be split into groups defined by a classifying factor, compute a function on the subsets, and return the results?

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