    
<p>Familiarity with the MIDFIELD data structure is a prerequisite for
working with midfieldr functions so we start by inspecting the practice
data in <a href="https://midfieldr.github.io/midfielddata/" class="external-link">midfielddata</a>, a
companion R package that provides anonymized student-level records for
98,000 undergraduates at three US institutions from 1988 through 2018.
(If you haven’t yet installed midfielddata, see the <a href="https://midfieldr.github.io/midfieldr/index.html#installat