pan><span class="op">)</span>, <span class="va">...</span><span class="op">)</span></span>
<span></span>
<span><span class="co"># S3 method for ivreg</span></span>
<span><span class="fu">find_formula</span><span class="op">(</span><span class="va">x</span>, <span class="va">...</span><span class="op">)</span></span>
<span></span>
<span><span class="co"># S3 method for ivreg</span></span>
<span><span class="fu">Anova</span><span class="op">(</span><span class="va">mod</span>, test.statistic <span class="op">