6">
<h2><span class="header-section-number">2.6</span> Appendix<a href="working-with-data.html#appendix" class="anchor-section" aria-label="Anchor link to header"></a></h2>
<div id="scales-of-measurement" class="section level3 hasAnchor" number="2.6.1">
<h3><span class="header-section-number">2.6.1</span> Scales of measurement<a href="working-with-data.html#scales-of-measurement" class="anchor-section" aria-label="Anchor link to header"></a></h3>
<p>All variables must take on at least two different possible