Tweak footnote wording

src/components/ChartPanel.jsx

@@ -244,18 +244,16 @@ export default function ChartPanel({ district, state }) {
         <p style={{ fontSize: '0.85rem', color: 'var(--cv-ink-2)', marginTop: 'var(--space-2)' }}>
           <strong>Student groups not shown.</strong> The CRDC also reports arrests for Asian,
           Hawaiian/Pacific Islander, and multiracial students. The underlying research does not
-          model these groups: it focuses on the four race/ethnicity groups where prior work has
-          documented the starkest disparities — Black and American Indian/Alaska Native students
-          relative to White students — with Hispanic students included for their large and growing
-          share of U.S. enrollment. Fitting every reported group would also have meant fitting 70
+          model these groups due to extreme sparsity in the outcome of interest and computational 
+          limits. Fitting every reported group would also have meant fitting 70
           stratified models rather than 40. Their absence here reflects that scope, not a finding
           about those students, and no estimate for them should be inferred from this page. See the{' '}
           <a href="https://crdc-api.civilytics.org/api/v1/" target="_blank" rel="noopener noreferrer">
             white paper
           </a>{' '}
           for the full rationale. Arrests that cannot be disaggregated by both race and sex —
-          including Section 504 students — are excluded upstream, as are schools not enrolling
-          grade 7 or above.
+          including Section 504 students — are excluded upstream, as are the small number of arrests in 
+            schools not enrolling grade 7 or above.
         </p>
       </div>
     </div>