s="header-section-number">2.3</span> What makes a good measurement?<a href="working-with-data.html#what-makes-a-good-measurement" class="anchor-section" aria-label="Anchor link to header"></a></h2>
<p>In many fields such as psychology, the thing that we are measuring is not a physical feature, but instead is an unobservable theoretical concept, which we usually refer to as a <em>construct</em>. For example, let’s say that I want to test how well you understand the distinction between the different types o