div>
<div class="section level3">
<h3 id="duplicate-for-purposes-of-illustration">Duplicate (for purposes of illustration)<a class="anchor" aria-label="anchor" href="#duplicate-for-purposes-of-illustration"></a>
</h3>
<p>Larger studies will include data for multiple countries and years.
The ECC data from UK in year <code>2000</code> can be duplicated for
<code>2001</code> and for a fictitious country <code>AB</code>. Although
the data are unchanged, the additional rows serve to illustrate the
functional pro