Draw a Marimekko / Mosaic Plot from a Tidy Data Frame

Low-level rectangle-coordinate builder for marimekko (mosaic) plots. Column widths are proportional to the per-column total of weight; within each column, segments stack to height 1 with sub-heights proportional to each row's share of that column's total.

Usage

plot_mosaic(
  data,
  x,
  y,
  weight,
  fill = "y",
  colors = NULL,
  show_labels = TRUE,
  label_size = 3.5,
  x_label = NULL,
  y_label = NULL
)

Arguments

data: A data.frame in long form. Must contain the columns named in x, y, and weight.
x: Column name for the X (column) variable.
y: Column name for the Y (segment) variable.
weight: Column name for the cell weight (e.g. count).
fill: Either "y" (color by Y category, e.g. state – default) or the name of another column to map to fill (e.g. a residual column for diverging color).
colors: Optional character vector of fill colors. When fill = "y", length must be at least the number of distinct y levels. Defaults to recycled Okabe-Ito.
show_labels: If TRUE, draw within-segment percentage labels.
label_size: Numeric size for segment labels.
x_label, y_label: Optional axis labels.

Value

A ggplot object.

Details

Used internally by plot_state_frequencies; exposed so that other plot methods (e.g. permutation-residual visualisations) can reuse the same geometry by supplying a different fill column.

Examples

df <- data.frame(
  group = rep(c("A", "B", "C"), each = 3),
  state = rep(c("s1", "s2", "s3"), 3),
  count = c(10, 5, 2,  7, 8, 3,  4, 6, 12)
)
plot_mosaic(df, x = "group", y = "state", weight = "count")