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The only reference I could find was this 4yo blog post but this seems a bit outdated.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:

Answer 1

I did it myself a time ago, using just geom_bar, I turned it into a general function so it should work on any two factors.

ggMMplot <- function(var1, var2){   require(ggplot2)   levVar1 <- length(levels(var1))   levVar2 <- length(levels(var2))    jointTable <- prop.table(table(var1, var2))   plotData <- as.data.frame(jointTable)   plotData$marginVar1 <- prop.table(table(var1))   plotData$var2Height <- plotData$Freq / plotData$marginVar1   plotData$var1Center <- c(0, cumsum(plotData$marginVar1)[1:levVar1 -1]) +     plotData$marginVar1 / 2    ggplot(plotData, aes(var1Center, var2Height)) +     geom_bar(stat = "identity", aes(width = marginVar1, fill = var2), col = "Black") +     geom_text(aes(label = as.character(var1), x = var1Center, y = 1.05))    }  ggMMplot(diamonds$cut, diamonds$clarity) 

Answer 2

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()