Stanford Education Data Archive (SEDA 2025.1)
Version 2025.1; 2022-2025 pooled evidence preferred, 2009-2019 historical fallback- Data
- All-student administrative-district pooled-by-subject math achievement on the nationally comparable Cohort Standardized scale, using Stanford's recommended Empirical-Bayes estimate and adjusted standard error.
- What it tells us
- Shows average tested-student math achievement in the matched public-school district. It does not show growth, causal school effectiveness, a single state's proficiency rate, or an individual child's likely outcome.