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    <p>An approach using ggplot</p> <pre><code># convert to a data frame dept_data &lt;- as.data.frame(dept.table) </code></pre> <p>Given you are attempting to plot the proportions (not the raw numbers)</p> <pre><code># add proportions library(plyr) dept_data_prop &lt;- ddply(dept_data, .(Var1), mutate, prop = Freq /sum(Freq)) library(ggplot2) ggplot(dept_data_prop, aes(x= Var1, y = prop, colour = Var2, fill = Var2)) + geom_bar() + coord_flip() + facet_wrap(~Var1, scales = 'free', ncol = 1) + opts(strip.background =theme_blank(), strip.text.x = theme_blank(), strip.text.y = theme_text(), axis.ticks = theme_blank(), axis.title.x = theme_blank(), axis.text.x = theme_blank()) + xlab('') + scale_fill_brewer('Student', type = 'div', palette = 5) + scale_colour_brewer('Student', type = 'div', palette = 5) + scale_x_discrete(expand = c(0,0)) + scale_y_continuous(expand=c(0,0)) </code></pre> <p>To find out more about the available options, look at <code>?opts</code></p> <p>The following is adapted from <a href="http://learnr.wordpress.com/2009/03/29/ggplot2_marimekko_mosaic_chart/" rel="nofollow">learning r</a></p> <p>To get the bar widths proportional to the total counts </p> <pre><code>dept_data &lt;- as.data.frame(dept.table) names(dept_data) &lt;- c('department', 'student', 'count') dept_prop &lt;- ddply(dept_data, .(department), mutate, prop_department = count / sum(count), max_department = cumsum(prop_department), min_department = max_department - prop_department, total_department = sum(count)) dept_prop &lt;- mutate(dept_prop, prop_total = total_department / sum(count)) dept_prop &lt;- ddply(dept_prop, .(student), mutate, max_total = cumsum(prop_total), min_total = max_total - prop_total) ggplot(dept_prop, aes(xmin = min_department, xmax = max_department, ymin = min_total, ymax = max_total)) + geom_rect(aes(colour = student, fill =student)) + facet_grid(department~., scales = 'free', space = 'free') + opts(strip.background =theme_blank(), strip.text.y = theme_text(hjust = 0.05), axis.ticks = theme_blank(), axis.title.x = theme_blank(), axis.text.x = theme_blank(), axis.title.y = theme_blank(), axis.text.y = theme_blank(), legend.position = 'bottom', legend.justification = 'left', panel.border = theme_blank(), panel.background = theme_blank(), panel.grid.major = theme_blank(), panel.grid.minor = theme_blank()) + xlab('') + scale_fill_brewer('Student', palette = 'Set1') + scale_colour_brewer('Student', palette = 'Set1') + scale_x_continuous(expand = c(0, 0)) + scale_y_continuous(expand = c(0, 0)) </code></pre>
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    1. COI like how polished it looks (which is a great advantage of ggplot!). Is there a way to make the bar widths proportional to the number of students in a given department? An advantage of mosaic plots over bar plots is that they add that second dimension of information.
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    2. COI hadn't noticed that feature. I've now edited the answer and given a [link](http://learnr.wordpress.com/2009/03/29/ggplot2_marimekko_mosaic_chart/) that might be useful.
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    3. COI've updated this approach again.
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