Because aggregate.formula has a formula argument but the generic
has an x argument neither of these work:
mtcars |> aggregate(x = mpg ~ cyl, FUN = mean)
mtcars |> aggregate(formula = mpg ~ cyl, FUN = mean)
This does work:
mtcars |> stats:::aggregate.formula(formula = mpg ~ cyl, FUN = mean)
Suggest that aggregate.formula be exported.
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