l">years</a></dt>
<dd><p>Create a &rsquo;duration&rsquo; X years long, or get the years in a &rsquo;duration&rsquo; X.
</p>
</dd>
</dl>
</div>
<div class="subsection-level-extent" id="Missing-Data">
<h4 class="subsection"><span>8.1.4 Missing Data<a class="copiable-link" href="#Missing-Data"> &para;</a></span></h4>
<dl class="table">
<dt><a class="ref" href="fillmissing.html">fillmissing</a></dt>
<dd><p>Fill missing values.
</p>
</dd>
<dt><a class="ref" href="ismissing.html">ismissing</a></dt>
<dd><p>Find mi