c</a></span><span class="op">(</span><span class="st">"counter_weight"</span><span class="op">)</span><span class="op">]</span>,</span></span>
<span class="r-in"><span>                                         ci_appr <span class="op">=</span> <span class="st">"matching"</span>,</span></span>
<span class="r-in"><span>                                         covar_bl_method <span class="op">=</span> <span class="st">"absolute"</span>,</span></span>
<span class="r-in"><span>                                    