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POCreating a Pareto Chart with ggplot2 and R
 

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  1. POCreating a Pareto Chart with ggplot2 and R
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    <p>I have been struggling with how to make a <a href="http://en.wikipedia.org/wiki/Pareto_chart" rel="noreferrer">Pareto Chart</a> in R using the ggplot2 package. In many cases when making a bar chart or histogram we want items sorted by the X axis. In a Pareto Chart we want the items ordered descending by the value in the Y axis. Is there a way to get ggplot to plot items ordered by the value in the Y axis? I tried sorting the data frame first but it seems ggplot reorders them. </p> <p>Example:</p> <pre><code>val &lt;- read.csv("http://www.cerebralmastication.com/wp-content/uploads/2009/11/val.txt") val&lt;-with(val, val[order(-Value), ]) p &lt;- ggplot(val) p + geom_bar(aes(State, Value, fill=variable), stat = "identity", position="dodge") + scale_fill_brewer(palette = "Set1") </code></pre> <p>the data frame val is sorted but the output looks like this:</p> <p><a href="http://www.cerebralmastication.com/wp-content/uploads/2009/11/exp.png" rel="noreferrer">alt text http://www.cerebralmastication.com/wp-content/uploads/2009/11/exp.png</a></p> <p>Hadley correctly pointed out that this produces a much better graphic for showing actuals vs. predicted:</p> <pre><code>ggplot(val, aes(State, Value)) + geom_bar(stat = "identity", subset = .(variable == "estimate"), fill = "grey70") + geom_crossbar(aes(ymin = Value, ymax = Value), subset = .(variable == "actual")) </code></pre> <p>which returns:</p> <p><a href="http://www.cerebralmastication.com/wp-content/uploads/2009/11/exp1.png" rel="noreferrer">alt text http://www.cerebralmastication.com/wp-content/uploads/2009/11/exp1.png</a></p> <p>But it's still not a Pareto Chart. Any tips?</p>
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    1. COYou can do this with base graphics using the par(new) trick of overplotting -- same approach as for the usual 'chart with two y-axes' problem. Ggplot2 I cannot help with (yet, one day maybe I get time to catch up on it).
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    2. COI'm trying soooo hard to avoid learning base graphics. I'm fantastically lazy :)
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