<!-- Generated by pkgdown: do not edit by hand --><htmllang="en"><head><metahttp-equiv="Content-Type"content="text/html; charset=UTF-8"><metacharset="utf-8"><metahttp-equiv="X-UA-Compatible"content="IE=edge"><metaname="viewport"content="width=device-width, initial-scale=1, shrink-to-fit=no"><title>Age in Years of Individuals — age • AMR (for R)</title><!-- favicons --><linkrel="icon"type="image/png"sizes="16x16"href="../favicon-16x16.png"><linkrel="icon"type="image/png"sizes="32x32"href="../favicon-32x32.png"><linkrel="apple-touch-icon"type="image/png"sizes="180x180"href="../apple-touch-icon.png"><linkrel="apple-touch-icon"type="image/png"sizes="120x120"href="../apple-touch-icon-120x120.png"><linkrel="apple-touch-icon"type="image/png"sizes="76x76"href="../apple-touch-icon-76x76.png"><linkrel="apple-touch-icon"type="image/png"sizes="60x60"href="../apple-touch-icon-60x60.png"><scriptsrc="../deps/jquery-3.6.0/jquery-3.6.0.min.js"></script><metaname="viewport"content="width=device-width, initial-scale=1, shrink-to-fit=no"><linkhref="../deps/bootstrap-5.3.1/bootstrap.min.css"rel="stylesheet"><scriptsrc="../deps/bootstrap-5.3.1/bootstrap.bundle.min.js"></script><linkhref="../deps/Lato-0.4.9/font.css"rel="stylesheet"><linkhref="../deps/Fira_Code-0.4.9/font.css"rel="stylesheet"><linkhref="../deps/font-awesome-6.4.2/css/all.min.css"rel="stylesheet"><linkhref="../deps/font-awesome-6.4.2/css/v4-shims.min.css"rel="stylesheet"><scriptsrc="../deps/headroom-0.11.0/headroom.min.js"></script><scriptsrc="../deps/headroom-0.11.0/jQuery.headroom.min.js"></script><scriptsrc="../deps/bootstrap-toc-1.0.1/bootstrap-toc.min.js"></script><scriptsrc="../deps/clipboard.js-2.0.11/clipboard.min.js"></script><scriptsrc="../deps/search-1.0.0/autocomplete.jquery.min.js"></script><scriptsrc="../deps/search-1.0.0/fuse.min.js"></script><scriptsrc="../deps/search-1.0.0/mark.min.js"></script><!-- pkgdown --><scriptsrc="../pkgdown.js"></script><linkhref="../extra.css"rel="stylesheet"><scriptsrc="../extra.js"></script><metaproperty="og:title"content="Age in Years of Individuals — age"><metaname="description"content="Calculates age in years based on a reference date, which is the system date at default."><metaproperty="og:description"content="Calculates age in years based on a reference date, which is the system date at default."><metaproperty="og:image"content="https://msberends.github.io/AMR/logo.svg"><metaname="twitter:card"content="summary_large_image"><metaname="twitter:creator"content="@msberends"><metaname="twitter:site"content="@msberends"></head><body>
<buttonclass="nav-link dropdown-toggle"type="button"id="dropdown-how-to"data-bs-toggle="dropdown"aria-expanded="false"aria-haspopup="true"><spanclass="fa fa-question-circle"></span> How to</button>
<ulclass="dropdown-menu"aria-labelledby="dropdown-how-to"><li><aclass="dropdown-item"href="../articles/AMR.html"><spanclass="fa fa-directions"></span> Conduct AMR Analysis</a></li>
<buttonclass="nav-link dropdown-toggle"type="button"id="dropdown-with-other-pkgs"data-bs-toggle="dropdown"aria-expanded="false"aria-haspopup="true"><spanclass="fa fa-layer-group"></span> With other pkgs</button>
<ulclass="dropdown-menu"aria-labelledby="dropdown-with-other-pkgs"><li><aclass="dropdown-item"href="../articles/other_pkg.html"><spanclass="fa fa-layer-group"></span> AMR & dplyr/tidyverse</a></li>
<li><aclass="dropdown-item"href="../articles/other_pkg.html"><spanclass="fa fa-layer-group"></span> AMR & data.table</a></li>
<li><aclass="dropdown-item"href="../articles/other_pkg.html"><spanclass="fa fa-layer-group"></span> AMR & tidymodels</a></li>
<li><aclass="dropdown-item"href="../articles/other_pkg.html"><spanclass="fa fa-layer-group"></span> AMR & base R</a></li>
<dd><p>date(s), <ahref="https://rdrr.io/r/base/character.html"class="external-link">character</a> (vectors) will be coerced with <code><ahref="https://rdrr.io/r/base/as.POSIXlt.html"class="external-link">as.POSIXlt()</a></code></p></dd>
<dd><p>reference date(s) (default is today), <ahref="https://rdrr.io/r/base/character.html"class="external-link">character</a> (vectors) will be coerced with <code><ahref="https://rdrr.io/r/base/as.POSIXlt.html"class="external-link">as.POSIXlt()</a></code></p></dd>
<dd><p>a <ahref="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 <ahref="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>
<dd><p>arguments passed on to <code><ahref="https://rdrr.io/r/base/as.POSIXlt.html"class="external-link">as.POSIXlt()</a></code>, such as <code>origin</code></p></dd>
<p>An <ahref="https://rdrr.io/r/base/integer.html"class="external-link">integer</a> (no decimals) if <code>exact = FALSE</code>, a <ahref="https://rdrr.io/r/base/double.html"class="external-link">double</a> (with decimals) otherwise</p>
<p>Ages below 0 will be returned as <code>NA</code> with a warning. Ages above 120 will only give a warning.</p>
<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>
<p><code>AMR</code> (for R). Free and open-source, licenced under the <atarget="_blank"href="https://github.com/msberends/AMR/blob/main/LICENSE"class="external-link">GNU General Public License version 2.0 (GPL-2)</a>.<br>Developed at the <atarget="_blank"href="https://www.rug.nl"class="external-link">University of Groningen</a> and <atarget="_blank"href="https://www.umcg.nl"class="external-link">University Medical Center Groningen</a> in The Netherlands.</p>
