<span class="op">=</span> <span class="fl">1974</span></span>
<span><span class="op">)</span></span>
<span></span>
<span><span class="co"># load example data</span></span>
<span><span class="fu"><a href="https://rdrr.io/r/utils/data.html" class="external-link">data</a></span><span class="op">(</span><span class="st">"ADEFF"</span><span class="op">)</span></span>
<span></span>
<span><span class="co"># set seed </span></span>
<span><span class="fu"><a href="https://rdrr.io/r/base/Random.html" class="external-