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    <p><a href="http://had.co.nz/ggplot2/stat_smooth.html" rel="noreferrer"><code>stat_smooth</code></a> does produce output that you can use elsewhere, and with a slightly hacky way, you can put it into a variable in the global environment.</p> <p>You enclose the output variable in <code>..</code> on either side to use it. So if you add an <code>aes</code> in the <code>stat_smooth</code> call and use the global assign, <code>&lt;&lt;-</code>, to assign the output to a varible in the global environment you can get the the fitted values, or others - see below.</p> <pre><code>qplot(hp,wt,data=mtcars) + stat_smooth(aes(outfit=fit&lt;&lt;-..y..)) fit [1] 1.993594 2.039986 2.087067 2.134889 2.183533 2.232867 2.282897 2.333626 [9] 2.385059 2.437200 2.490053 2.543622 2.597911 2.652852 2.708104 2.764156 [17] 2.821771 2.888224 2.968745 3.049545 3.115893 3.156368 3.175495 3.181411 [25] 3.182252 3.186155 3.201258 3.235698 3.291766 3.353259 3.418409 3.487074 [33] 3.559111 3.634377 3.712729 3.813399 3.910849 3.977051 4.037302 4.091635 [41] 4.140082 4.182676 4.219447 4.250429 4.275654 4.295154 4.308961 4.317108 [49] 4.319626 4.316548 4.308435 4.302276 4.297902 4.292303 4.282505 4.269040 [57] 4.253361 4.235474 4.215385 4.193098 4.168621 4.141957 4.113114 4.082096 [65] 4.048910 4.013560 3.976052 3.936392 3.894586 3.850639 3.804557 3.756345 [73] 3.706009 3.653554 3.598987 3.542313 3.483536 3.422664 3.359701 3.294654 </code></pre> <p>The outputs you can obtain are:</p> <ul> <li><code>y</code>, predicted value</li> <li><code>ymin</code>, lower pointwise confidence interval around the mean</li> <li><code>ymax</code>, upper pointwise confidence interval around the mean </li> <li><code>se</code>, standard error</li> </ul> <p>Note that by default it predicts on 80 data points, which may not be aligned with your original data.</p>
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    1. COYou're not kidding when you call that hacky. (You missed the `<<-` in your code.)
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    2. CO@joran Thanks, fixed now. Though I'm getting a bit suspicious about the numbers that its producing.
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    3. COI agree. I get an error when I try it with anything but `y`.
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