/code>: phosphorous condition categories
(<code>Poor</code> and <code>Good</code>)</li>
<li>
<code>NITR_COND</code>: nitrogen condition categories
(<code>Poor</code> <code>Fair</code>, and <code>Good</code>)</li>
</ul>
<p>Before proceeding, we load spsurvey by running</p>
<div class="sourceCode" id="cb2"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="kw"><a href="https://rdrr.io/r/base/library.html" class="external-link">library</a></span><span class="op">(</span><span clas