n class="co">#&gt; 6     155</span></code></pre></div>
<p>For each student, the data consist of their gender (<code>sex</code>) and two standardized exam scores— an intake score on the London Reading Test (LRT) at age 11 (<code>standLRT</code>) and a score on the General Certificate of Secondary Education (GCSE) examination at age 16 (<code>normexam</code>). Additionally, the students’ LRT scores were used to segment students into three categories (bottom 25%, middle 50%, and top 25%) based on their ver