n class="op">&lt;-</span> <span class="fu">check_df_visit</span><span class="op">(</span><span class="va">df_visit_filt</span><span class="op">)</span></span></span>
<span class="r-wrn co"><span class="r-pr">#&gt;</span> <span class="warning">Warning: </span>implicitly missing visit numbers detected and corrected</span>
<span class="r-in"><span><span class="fl">3</span> <span class="op"><a href="https://rdrr.io/r/base/match.html" class="external-link">%in%</a></span> <span class="va">df_visit_corr</span><sp