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<p>Now that we have the wide data, we can easily compare math and ela results for the same set school/year/grade/category. Below we will calculate a new column called <code class="docutils literal notranslate"><span class="pre">test_delta</span></code> that shows the difference between math and ela results for the same cohort of students in the same school. This will let us see, for example, which if any schools are “unbalanced” in math and ELA. Later, we might correlate this to other d