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POConditionally grouped histograms from my dataset
 

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  1. POConditionally grouped histograms from my dataset
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    <p>My current dataset <code>data.df</code> comes from about 420 students who took an 8-question survey under one of 3 instructors. <code>escore</code> is my outcome variable of interest. </p></p> <pre><code> 'data.frame': 426 obs. of 10 variables: $ ques01: int 1 1 1 1 1 1 0 0 0 1 ... $ ques02: int 0 0 1 1 1 1 1 1 1 1 ... $ ques03: int 0 0 1 1 0 0 1 1 0 1 ... $ ques04: int 1 0 1 1 1 1 1 1 1 1 ... $ ques05: int 0 0 0 0 1 0 0 0 0 0 ... $ ques06: int 1 0 1 1 0 1 1 1 1 1 ... $ ques07: int 0 0 1 1 0 1 1 0 0 1 ... $ ques08: int 0 0 1 1 1 0 1 1 0 1 ... $ inst : Factor w/ 3 levels "1","2","3": 1 1 1 1 1 1 1 1 1 1 ... $ escore: int 3 1 5 5 3 3 4 4 2 5 ... </code></pre> <p> I'm wondering how I can generate <code>escore</code> histograms that are conditionally separated based upon the value of <code>inst</code> for a given observation. In my head, the pseudo-code might look like this:</p> <p> <pre><code> par(mfrow=c(1,3)) hist(escore, data.df$inst = 1) hist(escore, data.df$inst = 2) hist(escore, data.df$inst = 3) </code></pre> </p> <p>but of course that won't work :-(</p> <p>Ideally, my histograms would look like this:</p> <p><a href="http://terpconnect.umd.edu/~briandk/escoreHistogramsbyInstructor-1.png" rel="nofollow noreferrer">3 separate histograms of ~140 observations each, grouped according to their &quot;inst&quot; value http://terpconnect.umd.edu/~briandk/escoreHistogramsbyInstructor-1.png</a></p> <p>As usual, I sense there's got to be an easy way to do this. In whatever "conditional/grouping" sense I can extract these graphs from my data, I assume it's <strong>got</strong> to be generalizable for all sorts of plots you'd want to make based on certain conditions.</p> <p>Also, I'm really sorry if this question has been answered before. My primary difficulty is in figuring out how to ask it in a way that makes sense.</p> <p>Thanks in advance for your help!</p></p>
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    1. COFYI, these are bar charts, not histograms, because the x axis is discrete.
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    2. CO@Hadley - Of course you're right, but that's because I made a poor artistic choice. What I sought, though, were histograms.
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