heir <code>counter_weight</code> value is
0. These data samples are probably far from the common support area, or
the resolution for <code>w</code> is not fine enough. In the case of
weighting, this is the inverse probability of getting exposure. In the
old versions (before <code>ver0.2.9</code>), this column was counter in
the matching approach and <code>ipw</code> in the weighting approach,
respectively.</p>
</div>
<div class="section level3">
<h3 id="is-there-a-public-data-set-that-i-can-test-my-model">8