an class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
        <span class="k">if</span> <span class="n">drop</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">groups</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
            <span class="k">return</span> <span class="n">BaseParestimate</span><span class="p">(</span><span class="n">par_obj</span><span class="o">=</span><span c