</h3>

<p>The respiratory status of patients recruited for a randomised clinical
multicenter trial.
</p>


<h3>Usage</h3>

<pre><code class='language-R'>data("respiratory")</code></pre>


<h3>Format</h3>

<p>A data frame with 555 observations on the following 7 variables.
</p>

<dl>
<dt><code>centre</code></dt><dd><p>the study center, a factor with levels <code>1</code> and
<code>2</code>.</p>
</dd>
<dt><code>treatment</code></dt><dd><p>the treatment arm, a factor with levels <code>placebo</code>
and <code>