Generate a frequency table of a factor grouped into top-n, bottom-n, and all other levels.
Get a frequency table of a factor variable, grouped into categories by level.
top_levels(input_vec, n = 2, show_na = FALSE)
input_vec |
the factor variable to tabulate. |
n |
number of levels to include in top and bottom groups |
show_na |
should cases where the variable is NA be shown? |
Returns a data.frame (actually a tbl_df) with the frequencies of the grouped, tabulated variable. Includes counts and percentages, and valid percentages (calculated omitting NA values, if present in the vector and show_na = TRUE.)
top_levels(as.factor(mtcars$hp), 2)
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