R group_by()

  • group_by() takes an existing tbl and converts it into a grouped tbl where operations are performed “by group”
  • ungroup() removes grouping.


  • .data: a data frame
  • … specify the variables by which the data fram should be grouped.
  • .add: When FALSE, group_by() will override existing groups. To add to the existing groups, use .add = TRUE.
  • .drop: used to determine the default behavior for dropping ungrouped columns



Both methods above gives us a 15 as the number of groups of manufacturers

learn more about summarize()

See a list of some summarize() tools that may be used here

Combine group_by and mutate()

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