lts contain columns with a <code>.P</code>
and <code>.U</code> suffixes. The <code>.P</code> suffix corresponds to
estimates of proportions for each category, while the <code>.U</code>
suffix corresponds to estimates of total units (i.e. extent) for each
category.</p>
<div class="section level3">
<h3 id="unstratified-analysis">Unstratified Analysis<a class="anchor" aria-label="anchor" href="#unstratified-analysis"></a>
</h3>
<p>To estimate the proportion of total lakes in each nitrogen condition
category a