recov = &quot;low&quot;</code>.</p>
<div class="sourceCode" id="cb12"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb12-1" data-line-number="1"><span class="co"># define binary ozone level</span></a>
<a class="sourceLine" id="cb12-2" data-line-number="2">ozonedat<span class="op">$</span>ozone1 &lt;-<span class="st"> </span><span class="kw">ifelse</span>(ozonedat<span class="op">$</span>Ozone <span class="op">&lt;</span><span class="st"> </span><span class="kw">quantile</spa