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Exercise

Margin plots

Facets are great for seeing subsets in a variable, but sometimes you want to see both those subsets and all values in a variable.

Here, the margins argument to facet_grid() is your friend.

  • FALSE (default): no margins.
  • TRUE: add margins to every variable being faceted by.
  • c("variable1", "variable2"): only add margins to the variables listed.

To make it easier to follow the facets, we've created two factor variables with proper labels — fam for the transmission type, and fvs for the engine type, respectively.

Zoom the graphics window to better view your plots.

Instructions 1/4
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  • 1

    Update the plot to facet the rows by fvs and fam, and columns by gear.

    • 2

      Add all possible margins to the plot.

    • 3

      Update the facets to only show margins on "fam".

    • 4

      Update the facets to only show margins on "gear" and "fvs".