p></li>
<li><p><code>n_observations</code>: number of observations at each site after all
filtering.</p></li>
</ul></div>
    <div id="details">
    <h2>Details</h2>
    <p>In addition to specifying the minimum and maximum number of
observations per site, users must specify the variables in the dataset that
define a "site". This is typically a combination of IDs defining the
geographic site and the unique observer (repeat visits are meant to be
conducted by the same observer). Finally, the closure period mu