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(v1.5.0.9006) major documentation update

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<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Key antibiotics for first weighted isolates — key_antibiotics • AMR (for R)</title>
<title>Key Antibiotics for First (Weighted) Isolates — key_antibiotics • AMR (for R)</title>
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<link rel="icon" type="image/png" sizes="16x16" href="../favicon-16x16.png">
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<meta property="og:title" content="Key antibiotics for first weighted isolates — key_antibiotics" />
<meta property="og:description" content="These function can be used to determine first isolates (see first_isolate()). Using key antibiotics to determine first isolates is more reliable than without key antibiotics. These selected isolates can then be called first weighted isolates." />
<meta property="og:title" content="Key Antibiotics for First (Weighted) Isolates — key_antibiotics" />
<meta property="og:description" content="These function can be used to determine first isolates (see first_isolate()). Using key antibiotics to determine first isolates is more reliable than without key antibiotics. These selected isolates can then be called first 'weighted' isolates." />
<meta property="og:image" content="https://msberends.github.io/AMR/logo.png" />
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<span class="navbar-brand">
<a class="navbar-link" href="../index.html">AMR (for R)</a>
<span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Latest development version">1.5.0</span>
<span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Latest development version">1.5.0.9006</span>
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<div class="row">
<div class="col-md-9 contents">
<div class="page-header">
<h1>Key antibiotics for first <em>weighted</em> isolates</h1>
<h1>Key Antibiotics for First (Weighted) Isolates</h1>
<small class="dont-index">Source: <a href='https://github.com/msberends/AMR/blob/master/R/key_antibiotics.R'><code>R/key_antibiotics.R</code></a></small>
<div class="hidden name"><code>key_antibiotics.Rd</code></div>
</div>
<div class="ref-description">
<p>These function can be used to determine first isolates (see <code><a href='first_isolate.html'>first_isolate()</a></code>). Using key antibiotics to determine first isolates is more reliable than without key antibiotics. These selected isolates can then be called first <em>weighted</em> isolates.</p>
<p>These function can be used to determine first isolates (see <code><a href='first_isolate.html'>first_isolate()</a></code>). Using key antibiotics to determine first isolates is more reliable than without key antibiotics. These selected isolates can then be called first 'weighted' isolates.</p>
</div>
<pre class="usage"><span class='fu'>key_antibiotics</span><span class='op'>(</span>
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</tr>
<tr>
<th>type</th>
<td><p>type to determine weighed isolates; can be <code>"keyantibiotics"</code> or <code>"points"</code>, see Details</p></td>
<td><p>type to determine weighed isolates; can be <code>"keyantibiotics"</code> or <code>"points"</code>, see <em>Details</em></p></td>
</tr>
<tr>
<th>ignore_I</th>
<td><p>logical to determine whether antibiotic interpretations with <code>"I"</code> will be ignored when <code>type = "keyantibiotics"</code>, see Details</p></td>
<td><p>logical to determine whether antibiotic interpretations with <code>"I"</code> will be ignored when <code>type = "keyantibiotics"</code>, see <em>Details</em></p></td>
</tr>
<tr>
<th>points_threshold</th>
<td><p>points until the comparison of key antibiotics will lead to inclusion of an isolate when <code>type = "points"</code>, see Details</p></td>
<td><p>points until the comparison of key antibiotics will lead to inclusion of an isolate when <code>type = "points"</code>, see <em>Details</em></p></td>
</tr>
<tr>
<th>info</th>
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<h2 class="hasAnchor" id="details"><a class="anchor" href="#details"></a>Details</h2>
<p>The <code>key_antibiotics()</code> function is context-aware when used inside <code>dplyr</code> verbs, such as <code><a href='https://dplyr.tidyverse.org/reference/filter.html'>filter()</a></code>, <code><a href='https://dplyr.tidyverse.org/reference/mutate.html'>mutate()</a></code> and <code><a href='https://dplyr.tidyverse.org/reference/summarise.html'>summarise()</a></code>. This means that then the <code>x</code> argument can be left blank, please see <em>Examples</em>.</p>
<p>The <code>key_antibiotics()</code> function is context-aware when used inside <code>dplyr</code> verbs, such as <code><a href='https://dplyr.tidyverse.org/reference/filter.html'>filter()</a></code>, <code><a href='https://dplyr.tidyverse.org/reference/mutate.html'>mutate()</a></code> and <code><a href='https://dplyr.tidyverse.org/reference/summarise.html'>summarise()</a></code>. This means that then the <code>x</code> argument can be left blank, see <em>Examples</em>.</p>
<p>The function <code>key_antibiotics()</code> returns a character vector with 12 antibiotic results for every isolate. These isolates can then be compared using <code>key_antibiotics_equal()</code>, to check if two isolates have generally the same antibiogram. Missing and invalid values are replaced with a dot (<code>"."</code>) by <code>key_antibiotics()</code> and ignored by <code>key_antibiotics_equal()</code>.</p>
<p>The <code><a href='first_isolate.html'>first_isolate()</a></code> function only uses this function on the same microbial species from the same patient. Using this, e.g. an MRSA will be included after a susceptible <em>S. aureus</em> (MSSA) is found within the same patient episode. Without key antibiotic comparison it would not. See <code><a href='first_isolate.html'>first_isolate()</a></code> for more info.</p>
<p>At default, the antibiotics that are used for <strong>Gram-positive bacteria</strong> are:</p><ul>
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</ul>
<p>The function <code>key_antibiotics_equal()</code> checks the characters returned by <code>key_antibiotics()</code> for equality, and returns a <code><a href='https://rdrr.io/r/base/logical.html'>logical</a></code> vector.</p>
<h2 class="hasAnchor" id="stable-lifecycle"><a class="anchor" href="#stable-lifecycle"></a>Stable lifecycle</h2>
<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, 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>
<p>If the unlying code needs breaking changes, they will occur gradually. For example, a argument will be deprecated and first 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="key-antibiotics"><a class="anchor" href="#key-antibiotics"></a>Key antibiotics</h2>
<h2 class="hasAnchor" id="key-antibiotics"><a class="anchor" href="#key-antibiotics"></a>Key Antibiotics</h2>
<p>There are two ways to determine whether isolates can be included as first <em>weighted</em> isolates which will give generally the same results:</p><ol>
<p>There are two ways to determine whether isolates can be included as first weighted isolates which will give generally the same results:</p><ol>
<li><p>Using <code>type = "keyantibiotics"</code> and argument <code>ignore_I</code></p>
<p>Any difference from S to R (or vice versa) will (re)select an isolate as a first weighted isolate. With <code>ignore_I = FALSE</code>, also differences from I to S|R (or vice versa) will lead to this. This is a reliable method and 30-35 times faster than method 2. Read more about this in the <code>key_antibiotics()</code> function.</p></li>
<li><p>Using <code>type = "points"</code> and argument <code>points_threshold</code></p>
<p>A difference from I to S|R (or vice versa) means 0.5 points, a difference from S to R (or vice versa) means 1 point. When the sum of points exceeds <code>points_threshold</code>, which default to <code>2</code>, an isolate will be (re)selected as a first weighted isolate.</p></li>
</ol>
<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>
<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>