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+    <h1>Calculate the 80th percentile according to FOCUS guidance</h1>
+    </div>
+
+    
+    <p>This is nowadays defined as the mean of the 16th and the 17th
+highest value. Previously, the 17th highest values was used (FOCUS 2014, p.
+18). NaN values need to be set to zero in order to reproduce the
+values obtained by PELMO.</p>
+    
+
+    <pre><span class='fu'>focus_80th</span>(<span class='no'>c_period</span>, <span class='kw'>old</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>)</pre>
+    
+    <h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a> Arguments</h2>
+    <dl class="dl-horizontal">
+      <dt>c_period</dt>
+      <dd>A numeric vector of values to calculate the percentile from</dd>
+      <dt>old</dt>
+      <dd>Should the old calculation method be used (the 17th highest value)?</dd>
+    </dl>
+    
+
+  </div>
+  <div class="col-md-3 hidden-xs hidden-sm" id="sidebar">
+    <h2>Contents</h2>
+    <ul class="nav nav-pills nav-stacked">
+      <li><a href="#arguments">Arguments</a></li>
+                </ul>
+
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