r - How to create a Marimekko/Mosaic plot in ggplot2

Question

The Marimekko/Mosaic plot is a nice default plot when both x and y are categorical variables. What is the best way to create these using ggplot?

The only reference I could find was this 4yo blog post but this seems a bit outdated. Are there any better or easier implementations avaialable by now? The GGally package has a function ggally_ratio but this produces something quite different:

question from:https://stackoverflow.com/questions/19233365/how-to-create-a-marimekko-mosaic-plot-in-ggplot2

Answer 1

I had the same issue for a project some time back. My solution was to use geom_bar together with the scales="free_x", space="free_x" option in facet_grid to accommodate different bar widths:

# using diamonds dataset for illustration
df <- diamonds %>%
  group_by(cut, clarity) %>%
  summarise(count = n()) %>%
  mutate(cut.count = sum(count),
         prop = count/sum(count)) %>%
  ungroup()

ggplot(df,
       aes(x = cut, y = prop, width = cut.count, fill = clarity)) +
  geom_bar(stat = "identity", position = "fill", colour = "black") +
  # geom_text(aes(label = scales::percent(prop)), position = position_stack(vjust = 0.5)) + # if labels are desired
  facet_grid(~cut, scales = "free_x", space = "free_x") +
  scale_fill_brewer(palette = "RdYlGn") +
  # theme(panel.spacing.x = unit(0, "npc")) + # if no spacing preferred between bars
  theme_void()