e-match-with-itself">9) Can a data sample match with itself?<a class="anchor" aria-label="anchor" href="#can-a-data-sample-match-with-itself"></a>
</h3>
<p>This question is commonly asked by researchers coming from matching
with binary exposures. In the CausalGPS package (and the algorithm), for
each exposure level and for each data sample, we generate a new data
sample that poses the requested exposure level; however, it has a
different GPS value. We find the closest original data (in terms of w
and GPS) t