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POGrid with choropleth maps in ggplot2
 

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    <p>Using Hadley's great ggplot2 and his book (pp. 78-79), I am able to produce single choropleth map plots with ease, using code like this:</p> <pre><code>states.df &lt;- map_data("state") states.df = subset(states.df,group!=8) # get rid of DC states.df$st &lt;- state.abb[match(states.df$region,tolower(state.name))] # attach state abbreviations states.df$value = value[states.df$st] p = qplot(long, lat, data = states.df, group = group, fill = value, geom = "polygon", xlab="", ylab="", main=main) + opts(axis.text.y=theme_blank(), axis.text.x=theme_blank(), axis.ticks = theme_blank()) + scale_fill_continuous (name) p2 = p + geom_path(data=states.df, color = "white", alpha = 0.4, fill = NA) + coord_map(project="polyconic") </code></pre> <p>Where "value" is the vector of state-level data I am plotting. But what if I want to plot multiple maps, grouped by some variable (or two)?</p> <p>Here's an example of a <a href="http://andrewgelman.com/2009/11/senators_and_he/" rel="noreferrer">plot done by Andrew Gelman, later adapted in the New York Times</a>, about health care opinion in the states:</p> <p><img src="https://i.stack.imgur.com/j2xjm.png" alt="enter image description here"></p> <p>I'd love to be able to emulate this example: show choropleth plots gridded according to two variables (or even one). So I pass not a vector of values, but rather a dataframe organized "long", with multiple entries for each state.</p> <p>I know ggplot2 can do this, but I'm not sure how. Thanks!</p>
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