isits.R" class="external-link"><code>R/filter-repeat-visits.R</code></a></small>
    <div class="hidden name"><code>filter_repeat_visits.Rd</code></div>
    </div>

    <div class="ref-description">
    <p>Hierarchical modeling of abundance and occurrence requires repeat visits to
sites to estimate detectability. These visits should be all be within a
period of closure, i.e. when the population can be assumed to be closed.
eBird data, and many other data sources, do not explicitly follow this
protocol; howe