ction_frequency &lt;dbl&gt;, n_detections &lt;dbl&gt;</span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># the sample sizes for each week can be access with</span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/attr.html" class="external-link">attr</a></span><span class="op">(</span><span class="va">barcharts</span>, <span class="st">"sample_sizes"</span><span class="op">)</span></span></span>
<span class="r-out co"><span 