dataframe.</span>
<span class="sd">    T : str</span>
<span class="sd">        The treatment column name.</span>
<span class="sd">    cols : str</span>
<span class="sd">        The column names to calculate the SMD, separated by &#39;+&#39;.</span>

<span class="sd">    Returns</span>
<span class="sd">    -------</span>
<span class="sd">    DataFrame</span>
<span class="sd">        The output dataframe with the SMD results.</span>

<span class="sd">    Example</span>
<span class="sd">    -------</span>

<sp