.4</span> Sampling from a population<a href="introduction.html#sampling-from-a-population" class="anchor-section" aria-label="Anchor link to header"></a></h3>
<p>The concept of aggregation implies that we can make useful insights by collapsing across data – but how much data do we need? The idea of <em>sampling</em> says that we can summarize an entire population based on just a small number of samples from the population, as long as those samples are obtained in the right way. For example, the PURE study