span class="op">(</span><span class="va">autocorrelation</span><span class="op">)</span><span class="op">)</span>, keyby <span class="op">=</span> <span class="fu">.</span><span class="op">(</span><span class="va">phi</span>, 
    <span class="va">sd</span><span class="op">)</span><span class="op">]</span>
<span class="fu">ggplot</span><span class="op">(</span><span class="va">summ</span>, <span class="fu">aes</span><span class="op">(</span>x <span class="op">=</span> <span class="va">sd</span>, y <span cla