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<h1>Age in years of individuals</h1>
<div class="hidden name"><code>age.Rd</code></div>
</div>
<div class="ref-description">
<p>Calculates age in years based on a reference date, which is the sytem date at default.</p>
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<pre class="usage"><span class='fu'>age</span>(<span class='no'>x</span>, <span class='kw'>reference</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/Sys.time.html'>Sys.Date</a></span>(), <span class='kw'>exact</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>, <span class='kw'>na.rm</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>)</pre>
<h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
<table class="ref-arguments">
<colgroup><col class="name" /><col class="desc" /></colgroup>
<tr>
<th>x</th>
<td><p>date(s), will be coerced with <code><a href='https://rdrr.io/r/base/as.POSIXlt.html'>as.POSIXlt()</a></code></p></td>
</tr>
<tr>
<th>reference</th>
<td><p>reference date(s) (defaults to today), will be coerced with <code><a href='https://rdrr.io/r/base/as.POSIXlt.html'>as.POSIXlt()</a></code> and cannot be lower than <code>x</code></p></td>
</tr>
<tr>
<th>exact</th>
<td><p>a logical to indicate whether age calculation should be exact, i.e. with decimals. It divides the number of days of <a href='https://en.wikipedia.org/wiki/Year-to-date'>year-to-date</a> (YTD) of <code>x</code> by the number of days in the year of <code>reference</code> (either 365 or 366).</p></td>
</tr>
<tr>
<th>na.rm</th>
<td><p>a logical to indicate whether missing values should be removed</p></td>
</tr>
</table>
<h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>
<p>An <a href='https://rdrr.io/r/base/integer.html'>integer</a> (no decimals) if <code>exact = FALSE</code>, a <a href='https://rdrr.io/r/base/double.html'>double</a> (with decimals) otherwise</p>
<h2 class="hasAnchor" id="stable-lifecycle"><a class="anchor" href="#stable-lifecycle"></a>Stable lifecycle</h2>
<p><img src='figures/lifecycle_stable.svg' style=margin-bottom:5px /> <br />
The <a href='lifecycle.html'>lifecycle</a> of this function is <strong>stable</strong>. In a stable function, we are largely happy with the unlying code, and major changes are unlikely. This means that the unlying code will generally evolve by adding new arguments; we will avoid removing arguments or changing the meaning of existing arguments.</p>
<p>If the unlying code needs breaking changes, they will occur gradually. To begin with, the function or argument will be deprecated; it will continue to work but will emit an message informing you of the change. Next, typically after at least one newly released version on CRAN, the message will be transformed to an error.</p>
<h2 class="hasAnchor" id="read-more-on-our-website-"><a class="anchor" href="#read-more-on-our-website-"></a>Read more on our website!</h2>
<p>On our website <a href='https://msberends.gitlab.io/AMR'>https://msberends.gitlab.io/AMR</a> you can find <a href='https://msberends.gitlab.io/AMR/articles/AMR.html'>a comprehensive tutorial</a> about how to conduct AMR analysis, the <a href='https://msberends.gitlab.io/AMR/reference'>complete documentation of all functions</a> (which reads a lot easier than here in R) and <a href='https://msberends.gitlab.io/AMR/articles/WHONET.html'>an example analysis using WHONET data</a>.</p>
<h2 class="hasAnchor" id="see-also"><a class="anchor" href="#see-also"></a>See also</h2>
<div class='dont-index'><p>To split ages into groups, use the <code><a href='age_groups.html'>age_groups()</a></code> function.</p></div>
<h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
<pre class="examples"><span class='co'># 10 random birth dates</span>
<span class='no'>df</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='https://rdrr.io/r/base/data.frame.html'>data.frame</a></span>(<span class='kw'>birth_date</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/Sys.time.html'>Sys.Date</a></span>() - <span class='fu'><a href='https://rdrr.io/r/stats/Uniform.html'>runif</a></span>(<span class='fl'>10</span>) * <span class='fl'>25000</span>)
<span class='co'># add ages</span>
<span class='no'>df</span>$<span class='no'>age</span> <span class='kw'>&lt;-</span> <span class='fu'>age</span>(<span class='no'>df</span>$<span class='no'>birth_date</span>)
<span class='co'># add exact ages</span>
<span class='no'>df</span>$<span class='no'>age_exact</span> <span class='kw'>&lt;-</span> <span class='fu'>age</span>(<span class='no'>df</span>$<span class='no'>birth_date</span>, <span class='kw'>exact</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>)
<span class='no'>df</span></pre>
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<h2>Contents</h2>
<ul class="nav nav-pills nav-stacked">
<li><a href="#arguments">Arguments</a></li>
<li><a href="#value">Value</a></li>
<li><a href="#stable-lifecycle">Stable lifecycle</a></li>
<li><a href="#read-more-on-our-website-">Read more on our website!</a></li>
<li><a href="#see-also">See also</a></li>
<li><a href="#examples">Examples</a></li>
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