ype =</span> <span class="dv">2</span>) <span class="op">+</span><span class="st"> </span><span class="kw">facet_grid</span>(<span class="dt">rows =</span> <span class="kw">vars</span>(sensor) , <span class="dt">scales =</span> <span class="st">&quot;free_y&quot;</span>)</code></pre></div>
<div id="data-cleaning" class="section level3">
<h3><span class="header-section-number">6.1.1</span> Data cleaning</h3>
<p>  </p>
<p>Raw accelerometer data need to be cleaned before analyses can be run. Typical data impor