pan>
<span><span class="op">)</span></span></code></pre></div>
    </div>

    <div id="arguments">
    <h2>Arguments</h2>
    <dl><dt>formula</dt>
<dd><p>A formula indicating which variables are to be used.
Semantics are approximately as in <code><a href="https://rdrr.io/r/stats/lm.html" class="external-link">lm()</a></code> since <code><a href="https://rdrr.io/r/stats/model.frame.html" class="external-link">stats::model.frame()</a></code>
is used to turn the formula into a data frame.  But first condition