he full dataset</span>
    <span class="n">df_full</span> <span class="o">=</span> <span class="n">pd</span><span class="o">.</span><span class="n">concat</span><span class="p">(</span><span class="n">universe</span><span class="p">,</span> <span class="n">axis</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>

    <span class="c1"># Doing a forward fill to ensure that every time series has entries on</span>
    <span class="c1"># every day. (Different series might have gaps on