rceCode"><pre class="sourceCode r"><code><span><span class="kw"><a href="https://rdrr.io/r/base/library.html" class="external-link">library</a></span><span class="op">(</span><span class="st">"psychotree"</span><span class="op">)</span></span>
<span><span class="kw"><a href="https://rdrr.io/r/base/library.html" class="external-link">library</a></span><span class="op">(</span><span class="st"><a href="https://hturner.github.io/PlackettLuce/" class="external-link">"PlackettLuce"</a></span><span class="op">)</