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<h1>Age in Years of Individuals</h1>
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<small class="dont-index">Source: <a href="https://github.com/msberends/AMR/blob/HEAD/R/age.R" class="external-link"><code>R/age.R</code></a></small>
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<div class="hidden name"><code>age.Rd</code></div>
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<div class="ref-description">
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<p>Calculates age in years based on a reference date, which is the sytem date at default.</p>
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</div>
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<div id="ref-usage">
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<div class="sourceCode"><pre class="sourceCode r"><code><span class="fu">age</span><span class="op">(</span><span class="va">x</span>, reference <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Sys.time.html" class="external-link">Sys.Date</a></span><span class="op">(</span><span class="op">)</span>, exact <span class="op">=</span> <span class="cn">FALSE</span>, na.rm <span class="op">=</span> <span class="cn">FALSE</span>, <span class="va">...</span><span class="op">)</span></code></pre></div>
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<div id="arguments">
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<h2>Arguments</h2>
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<dl><dt>x</dt>
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<dd><p>date(s), <a href="https://rdrr.io/r/base/character.html" class="external-link">character</a> (vectors) will be coerced with <code><a href="https://rdrr.io/r/base/as.POSIXlt.html" class="external-link">as.POSIXlt()</a></code></p></dd>
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<dt>reference</dt>
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<dd><p>reference date(s) (defaults to today), <a href="https://rdrr.io/r/base/character.html" class="external-link">character</a> (vectors) will be coerced with <code><a href="https://rdrr.io/r/base/as.POSIXlt.html" class="external-link">as.POSIXlt()</a></code></p></dd>
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<dt>exact</dt>
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<dd><p>a <a href="https://rdrr.io/r/base/logical.html" class="external-link">logical</a> 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" class="external-link">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></dd>
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<dt>na.rm</dt>
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<dd><p>a <a href="https://rdrr.io/r/base/logical.html" class="external-link">logical</a> to indicate whether missing values should be removed</p></dd>
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<dt>...</dt>
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<dd><p>arguments passed on to <code><a href="https://rdrr.io/r/base/as.POSIXlt.html" class="external-link">as.POSIXlt()</a></code>, such as <code>origin</code></p></dd>
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</dl></div>
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<div id="value">
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<h2>Value</h2>
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<p>An <a href="https://rdrr.io/r/base/integer.html" class="external-link">integer</a> (no decimals) if <code>exact = FALSE</code>, a <a href="https://rdrr.io/r/base/double.html" class="external-link">double</a> (with decimals) otherwise</p>
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</div>
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<div id="details">
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<h2>Details</h2>
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<p>Ages below 0 will be returned as <code>NA</code> with a warning. Ages above 120 will only give a warning.</p>
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<p>This function vectorises over both <code>x</code> and <code>reference</code>, meaning that either can have a length of 1 while the other argument has a larger length.</p>
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</div>
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<div id="stable-lifecycle">
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<h2>Stable Lifecycle</h2>
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<p><img src="figures/lifecycle_stable.svg" style='margin-bottom:"5"'><br>
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The <a href="lifecycle.html">lifecycle</a> of this function is <strong>stable</strong>. In a stable function, major changes are unlikely. This means that the unlying code will generally evolve by adding new arguments; removing arguments or changing the meaning of existing arguments will be avoided.</p>
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<p>If the unlying code needs breaking changes, they will occur gradually. For example, an argument will be deprecated and first continue to work, but will emit a 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>
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<div id="read-more-on-our-website-">
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<h2>Read more on Our Website!</h2>
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<p>On our website <a href="https://msberends.github.io/AMR/">https://msberends.github.io/AMR/</a> you can find <a href="https://msberends.github.io/AMR/articles/AMR.html">a comprehensive tutorial</a> about how to conduct AMR data analysis, the <a href="https://msberends.github.io/AMR/reference/">complete documentation of all functions</a> and <a href="https://msberends.github.io/AMR/articles/WHONET.html">an example analysis using WHONET data</a>.</p>
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<div id="see-also">
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<h2>See also</h2>
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<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>
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</div>
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<div id="ref-examples">
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<h2>Examples</h2>
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<div class="sourceCode"><pre class="sourceCode r"><code><span class="co"># 10 random birth dates</span>
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<span class="va">df</span> <span class="op"><-</span> <span class="fu"><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame</a></span><span class="op">(</span>birth_date <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Sys.time.html" class="external-link">Sys.Date</a></span><span class="op">(</span><span class="op">)</span> <span class="op">-</span> <span class="fu"><a href="https://rdrr.io/r/stats/Uniform.html" class="external-link">runif</a></span><span class="op">(</span><span class="fl">10</span><span class="op">)</span> <span class="op">*</span> <span class="fl">25000</span><span class="op">)</span>
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<span class="co"># add ages</span>
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<span class="va">df</span><span class="op">$</span><span class="va">age</span> <span class="op"><-</span> <span class="fu">age</span><span class="op">(</span><span class="va">df</span><span class="op">$</span><span class="va">birth_date</span><span class="op">)</span>
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<span class="co"># add exact ages</span>
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<span class="va">df</span><span class="op">$</span><span class="va">age_exact</span> <span class="op"><-</span> <span class="fu">age</span><span class="op">(</span><span class="va">df</span><span class="op">$</span><span class="va">birth_date</span>, exact <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span>
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<span class="va">df</span>
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</code></pre></div>
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