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<!-- Generated by pkgdown: do not edit by hand --><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><title>Drop unused levels preserving label data — fct_drop • REDCapCAST</title><!-- favicons --><link rel="icon" type="image/png" sizes="16x16" href="../favicon-16x16.png"><link rel="icon" type="image/png" sizes="32x32" href="../favicon-32x32.png"><link rel="apple-touch-icon" type="image/png" sizes="180x180" href="../apple-touch-icon.png"><link rel="apple-touch-icon" type="image/png" sizes="120x120" href="../apple-touch-icon-120x120.png"><link rel="apple-touch-icon" type="image/png" sizes="76x76" href="../apple-touch-icon-76x76.png"><link rel="apple-touch-icon" type="image/png" sizes="60x60" href="../apple-touch-icon-60x60.png"><script src="../deps/jquery-3.6.0/jquery-3.6.0.min.js"></script><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><link href="../deps/bootstrap-5.3.1/bootstrap.min.css" rel="stylesheet"><script src="../deps/bootstrap-5.3.1/bootstrap.bundle.min.js"></script><link href="../deps/font-awesome-6.5.2/css/all.min.css" rel="stylesheet"><link href="../deps/font-awesome-6.5.2/css/v4-shims.min.css" rel="stylesheet"><script src="../deps/headroom-0.11.0/headroom.min.js"></script><script src="../deps/headroom-0.11.0/jQuery.headroom.min.js"></script><script src="../deps/bootstrap-toc-1.0.1/bootstrap-toc.min.js"></script><script src="../deps/clipboard.js-2.0.11/clipboard.min.js"></script><script src="../deps/search-1.0.0/autocomplete.jquery.min.js"></script><script src="../deps/search-1.0.0/fuse.min.js"></script><script src="../deps/search-1.0.0/mark.min.js"></script><!-- pkgdown --><script src="../pkgdown.js"></script><meta property="og:title" content="Drop unused levels preserving label data — fct_drop"><meta name="description" content="This extends [forcats::fct_drop()] to natively work across a data.frame and
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replaces [base::droplevels()]."><meta property="og:description" content="This extends [forcats::fct_drop()] to natively work across a data.frame and
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replaces [base::droplevels()]."><meta property="og:image" content="https://agdamsbo.github.io/REDCapCAST/logo.png"></head><body>
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<img src="../logo.png" class="logo" alt=""><h1>Drop unused levels preserving label data</h1>
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<small class="dont-index">Source: <a href="https://github.com/agdamsbo/REDCapCAST/blob/main/R/fct_drop.R" class="external-link"><code>R/fct_drop.R</code></a></small>
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<div class="d-none name"><code>fct_drop.Rd</code></div>
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</div>
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<div class="ref-description section level2">
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<p>This extends [forcats::fct_drop()] to natively work across a data.frame and
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replaces [base::droplevels()].</p>
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</div>
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<div class="section level2">
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<h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
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<div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">fct_drop</span><span class="op">(</span><span class="va">x</span>, <span class="va">...</span><span class="op">)</span></span>
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<span></span>
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<span><span class="co"># S3 method for class 'data.frame'</span></span>
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<span><span class="fu">fct_drop</span><span class="op">(</span><span class="va">x</span>, <span class="va">...</span><span class="op">)</span></span>
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<span></span>
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<span><span class="co"># S3 method for class 'factor'</span></span>
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<span><span class="fu">fct_drop</span><span class="op">(</span><span class="va">x</span>, <span class="va">...</span><span class="op">)</span></span></code></pre></div>
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</div>
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<div class="section level2">
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<h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2>
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<dl><dt id="arg-x">x<a class="anchor" aria-label="anchor" href="#arg-x"></a></dt>
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<dd><p>Factor to drop unused levels</p></dd>
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<dt id="arg--">...<a class="anchor" aria-label="anchor" href="#arg--"></a></dt>
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<dd><p>Other arguments passed down to method.</p></dd>
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</dl></div>
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<div class="section level2">
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<h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
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<div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="va">mtcars</span> <span class="op">|></span></span></span>
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<span class="r-in"><span> <span class="fu"><a href="numchar2fct.html">numchar2fct</a></span><span class="op">(</span><span class="op">)</span> <span class="op">|></span></span></span>
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<span class="r-in"><span> <span class="fu">fct_drop</span><span class="op">(</span><span class="op">)</span></span></span>
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<span class="r-out co"><span class="r-pr">#></span> <span style="color: #949494;"># A tibble: 32 × 11</span></span>
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<span class="r-out co"><span class="r-pr">#></span> mpg cyl disp hp drat wt qsec vs am gear carb </span>
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<span class="r-out co"><span class="r-pr">#></span> <span style="color: #949494; font-style: italic;"><dbl></span> <span style="color: #949494; font-style: italic;"><fct></span> <span style="color: #949494; font-style: italic;"><dbl></span> <span style="color: #949494; font-style: italic;"><dbl></span> <span style="color: #949494; font-style: italic;"><dbl></span> <span style="color: #949494; font-style: italic;"><dbl></span> <span style="color: #949494; font-style: italic;"><dbl></span> <span style="color: #949494; font-style: italic;"><fct></span> <span style="color: #949494; font-style: italic;"><fct></span> <span style="color: #949494; font-style: italic;"><fct></span> <span style="color: #949494; font-style: italic;"><fct></span></span>
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<span class="r-out co"><span class="r-pr">#></span> <span style="color: #BCBCBC;"> 1</span> 21 6 160 110 3.9 2.62 16.5 0 1 4 4 </span>
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<span class="r-out co"><span class="r-pr">#></span> <span style="color: #BCBCBC;"> 2</span> 21 6 160 110 3.9 2.88 17.0 0 1 4 4 </span>
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<span class="r-out co"><span class="r-pr">#></span> <span style="color: #BCBCBC;"> 3</span> 22.8 4 108 93 3.85 2.32 18.6 1 1 4 1 </span>
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<span class="r-out co"><span class="r-pr">#></span> <span style="color: #BCBCBC;"> 4</span> 21.4 6 258 110 3.08 3.22 19.4 1 0 3 1 </span>
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<span class="r-out co"><span class="r-pr">#></span> <span style="color: #BCBCBC;"> 5</span> 18.7 8 360 175 3.15 3.44 17.0 0 0 3 2 </span>
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<span class="r-out co"><span class="r-pr">#></span> <span style="color: #BCBCBC;"> 6</span> 18.1 6 225 105 2.76 3.46 20.2 1 0 3 1 </span>
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<span class="r-out co"><span class="r-pr">#></span> <span style="color: #BCBCBC;"> 7</span> 14.3 8 360 245 3.21 3.57 15.8 0 0 3 4 </span>
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<span class="r-out co"><span class="r-pr">#></span> <span style="color: #BCBCBC;"> 8</span> 24.4 4 147. 62 3.69 3.19 20 1 0 4 2 </span>
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<span class="r-out co"><span class="r-pr">#></span> <span style="color: #BCBCBC;"> 9</span> 22.8 4 141. 95 3.92 3.15 22.9 1 0 4 2 </span>
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<span class="r-out co"><span class="r-pr">#></span> <span style="color: #BCBCBC;">10</span> 19.2 6 168. 123 3.92 3.44 18.3 1 0 4 4 </span>
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<span class="r-out co"><span class="r-pr">#></span> <span style="color: #949494;"># ℹ 22 more rows</span></span>
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<span class="r-in"><span><span class="va">mtcars</span> <span class="op">|></span></span></span>
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<span class="r-in"><span> <span class="fu"><a href="numchar2fct.html">numchar2fct</a></span><span class="op">(</span><span class="op">)</span> <span class="op">|></span></span></span>
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<span class="r-in"><span> <span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/mutate.html" class="external-link">mutate</a></span><span class="op">(</span>vs <span class="op">=</span> <span class="fu">fct_drop</span><span class="op">(</span><span class="va">vs</span><span class="op">)</span><span class="op">)</span></span></span>
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<span class="r-out co"><span class="r-pr">#></span> mpg cyl disp hp drat wt qsec vs am gear carb</span>
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<span class="r-out co"><span class="r-pr">#></span> Mazda RX4 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4</span>
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<span class="r-out co"><span class="r-pr">#></span> Mazda RX4 Wag 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4</span>
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<span class="r-out co"><span class="r-pr">#></span> Datsun 710 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1</span>
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<span class="r-out co"><span class="r-pr">#></span> Hornet 4 Drive 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1</span>
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<span class="r-out co"><span class="r-pr">#></span> Hornet Sportabout 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2</span>
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<span class="r-out co"><span class="r-pr">#></span> Valiant 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1</span>
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<span class="r-out co"><span class="r-pr">#></span> Duster 360 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4</span>
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<span class="r-out co"><span class="r-pr">#></span> Merc 240D 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2</span>
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<span class="r-out co"><span class="r-pr">#></span> Merc 230 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2</span>
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<span class="r-out co"><span class="r-pr">#></span> Merc 280 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4</span>
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<span class="r-out co"><span class="r-pr">#></span> Merc 280C 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4</span>
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<span class="r-out co"><span class="r-pr">#></span> Merc 450SE 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3</span>
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<span class="r-out co"><span class="r-pr">#></span> Merc 450SL 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3</span>
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<span class="r-out co"><span class="r-pr">#></span> Merc 450SLC 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3</span>
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<span class="r-out co"><span class="r-pr">#></span> Cadillac Fleetwood 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4</span>
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<span class="r-out co"><span class="r-pr">#></span> Lincoln Continental 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4</span>
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<span class="r-out co"><span class="r-pr">#></span> Chrysler Imperial 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4</span>
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<span class="r-out co"><span class="r-pr">#></span> Fiat 128 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1</span>
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<span class="r-out co"><span class="r-pr">#></span> Honda Civic 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2</span>
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<span class="r-out co"><span class="r-pr">#></span> Toyota Corolla 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1</span>
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<span class="r-out co"><span class="r-pr">#></span> Toyota Corona 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1</span>
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<span class="r-out co"><span class="r-pr">#></span> Dodge Challenger 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2</span>
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<span class="r-out co"><span class="r-pr">#></span> AMC Javelin 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2</span>
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<span class="r-out co"><span class="r-pr">#></span> Camaro Z28 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4</span>
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<span class="r-out co"><span class="r-pr">#></span> Pontiac Firebird 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2</span>
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<span class="r-out co"><span class="r-pr">#></span> Fiat X1-9 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1</span>
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<span class="r-out co"><span class="r-pr">#></span> Porsche 914-2 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2</span>
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<span class="r-out co"><span class="r-pr">#></span> Lotus Europa 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2</span>
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<span class="r-out co"><span class="r-pr">#></span> Ford Pantera L 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4</span>
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<span class="r-out co"><span class="r-pr">#></span> Ferrari Dino 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6</span>
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<span class="r-out co"><span class="r-pr">#></span> Maserati Bora 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8</span>
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<span class="r-out co"><span class="r-pr">#></span> Volvo 142E 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2</span>
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</code></pre></div>
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