 propensity score column name.</span>
<span class="sd">        exacts : list, default=&#39;&#39;</span>
<span class="sd">            The column names for exact matching, [&#39;x_cat1&#39;].</span>
<span class="sd">        alias : str, default=&#39;matching_index&#39;</span>
<span class="sd">            The alias for the matching index column in the output dataframe.</span>

<span class="sd">        Returns</span>
<span class="sd">        -------</span>
<span class="sd">        DataFrame</span>
<span class="