an>
<span class="sd">            Self.</span>
<span class="sd">        """</span>
        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">use_exog</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">fitted_model_</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">model</span><span class="p">(</span><span class="n">endog</span><span class="o">=</span><span 