Income vs Poverty Reassessment Note Corrected purpose-sensitive rebuild: 2026-09-10. Original artifact date retained in filename: 2026-02-20. Question How do enrolled-student poverty and school-address tract income compare for ordinary neighborhood elementary schools when tract adult BA+ and tested-grade attendance are held consistent? Primary estimand and units - Academic year: 2024-2025; population: Total Population (All Students); outcome row: official ODE All Grades. - Primary universe: explicit ODE Regular schools, excluding charter, virtual, and curated special-enrollment flags, with a nonempty cross-subject observed tested-grade set confined to grades 3-5. - Middle schools with observed tested grades confined to 6-8 are reported only as a sensitivity. Mixed-grade and high-school profiles are excluded. - Outcome is proficiency percentage points, calculated as 100 * (Level 3 + Level 4) / Scored Performance Denominator. - Every retained row must have complete integer Level 1-4 counts, their sum must equal Scored Performance Denominator, and Level 3 + Level 4 must equal Number Proficient. - Model weights are scored students. Participant counts are not achievement denominators. - BA+ is a tract adult share converted from a 0-1 fraction to percent; attendance and SEP are 0-100 percent; income fields are nominal ACS dollars. - Primary SEP models use ODE exact values plus the ETL's documented interval midpoint for valid left-censored values (2.5 percentage points for <5%). These midpoint values are explicit estimates, not exact observations. - Lower- and upper-endpoint scenarios test the disclosed interval bounds; an exact-only complete-case scenario tests sensitivity to dropping censored schools. - CV R^2 is five-fold out-of-sample prediction repeated over five fixed school-row splits. In-sample weighted R^2 is separately labeled. Primary elementary documented-midpoint SEP results - ELA: model-specific samples income=457, poverty=457, both=457 schools; income-model scored students=84,996; mean repeated-CV weighted R^2 income=0.6767, poverty=0.7676, both=0.7727; poverty-minus-income=+0.0909, both-minus-income=+0.0961. - Math: model-specific samples income=456, poverty=456, both=456 schools; income-model scored students=84,607; mean repeated-CV weighted R^2 income=0.6788, poverty=0.7475, both=0.7485; poverty-minus-income=+0.0687, both-minus-income=+0.0697. - Science: model-specific samples income=433, poverty=433, both=433 schools; income-model scored students=28,388; mean repeated-CV weighted R^2 income=0.5636, poverty=0.6538, both=0.6546; poverty-minus-income=+0.0902, both-minus-income=+0.0910. - Sensitivity conclusion: for every subject, lower endpoint, midpoint, upper endpoint, and exact-only complete cases preserve the same CV R^2 ordering (income < poverty < income plus poverty); the SEP treatment does not change the substantive ranking. Coverage and sensitivity - ELA elementary (primary): 457 validated BA/attendance rows before estimand-specific missingness; 452 exact-SEP rows; 457 rows in the documented-midpoint scenario; 13 rows omitted for unavailable or invalid attendance; 0 rows failed achievement-count validation. - ELA middle (sensitivity): 188 validated BA/attendance rows before estimand-specific missingness; 188 exact-SEP rows; 188 rows in the documented-midpoint scenario; 5 rows omitted for unavailable or invalid attendance; 0 rows failed achievement-count validation. - Math elementary (primary): 456 validated BA/attendance rows before estimand-specific missingness; 451 exact-SEP rows; 456 rows in the documented-midpoint scenario; 13 rows omitted for unavailable or invalid attendance; 0 rows failed achievement-count validation. - Math middle (sensitivity): 187 validated BA/attendance rows before estimand-specific missingness; 187 exact-SEP rows; 187 rows in the documented-midpoint scenario; 5 rows omitted for unavailable or invalid attendance; 0 rows failed achievement-count validation. - Science elementary (primary): 433 validated BA/attendance rows before estimand-specific missingness; 427 exact-SEP rows; 433 rows in the documented-midpoint scenario; 5 rows omitted for unavailable or invalid attendance; 0 rows failed achievement-count validation. - Science middle (sensitivity): 188 validated BA/attendance rows before estimand-specific missingness; 188 exact-SEP rows; 188 rows in the documented-midpoint scenario; 2 rows omitted for unavailable or invalid attendance; 0 rows failed achievement-count validation. Interpretation - The numeric contrasts above are derived from the machine-readable model table, not manually transcribed claims. - Tract SES is treated as school-site neighborhood context. The elementary restriction makes that proxy more defensible; middle-school estimates remain labeled sensitivities because their catchments commonly exceed one tract. - The documented midpoint defines the primary SEP estimate so the lowest-poverty censored schools are not dropped from the headline sample. Lower/upper endpoints and exact-only complete cases remain separate sensitivities. Each model and correlation applies only its own required-field missingness rule. - These are descriptive school-level associations and predictive comparisons, not causal estimates or student-level relationships. Machine-readable companions - income_poverty_reassessment_model_summary_2026-09-10.csv: model metrics, explicit units, in-sample fit, repeated-CV fit, and correlations. - income_poverty_reassessment_coverage_2026-09-10.csv: filter, validation, and SEP-scenario coverage counts. - income_poverty_reassessment_school_rows_2026-09-10.csv: validated elementary and middle school rows before SEP-scenario selection.