US School Index Policy
Effective date: July 19, 2026
US School Index publishes rankings to organize comparable statistical values. A ranking describes relative position for a specific metric, source and reporting period. It does not represent a complete judgment about the quality of a state, school system, institution or community.
Purpose of rankings
Rankings are used to help readers identify patterns, compare values and locate states or jurisdictions within a distribution. Each ranking should be interpreted together with the metric definition, source year, methodology and limitations.
A high rank can have a different meaning depending on the indicator. Higher graduation rates may generally be viewed positively, while higher tuition or pupil-teacher ratios may not be. Some measures, including enrollment totals and numbers of school districts, are descriptive and have no inherently favorable direction.
Source and reporting period
Each ranking should identify the dataset and reporting period used. Values from different years, releases or definitions should not be combined into one ranking unless the methodology explains how comparability was established.
A page edition year does not automatically represent the data year. The ranking remains tied to the reporting period of the underlying source.
Geographic coverage
A state ranking commonly includes the 50 states and the District of Columbia. Other jurisdictions may be included when comparable source data is available and the expanded scope is clearly disclosed.
Missing or suppressed jurisdictions should not receive an artificial zero or last-place rank unless zero is a valid reported value.
Default ranking method
Unless a page states otherwise, values are sorted from highest to lowest. Equal values receive the same rank, and the next rank reflects the number of preceding rows.
Under this competition-ranking method, the sequence may appear as:
1, 2, 2, 4
If lower values are ranked first, that direction should be stated near the table.
Ties
States with equal comparison values should normally share the same rank. Alphabetical order may be used only to determine display order within the tied group and should not be interpreted as a ranking advantage.
When displayed values are rounded but the original source contains more precise values, ranking may be based on the unrounded values. A note should identify this practice because values that appear equal may otherwise receive different ranks.
Rounding and precision
Values may be rounded for readability. Rounding can create apparent ties or small differences that are not visible in the table.
Rankings should not imply a meaningful distinction when the difference is smaller than the statistical precision of the source. This is particularly important for survey estimates, assessment scores and values with margins of error.
Estimates and statistical uncertainty
Some rankings are based on estimates rather than complete administrative counts. Differences between estimates may not be statistically significant.
When margins of error, confidence intervals or significance tests are available, they should be considered before describing one jurisdiction as definitively higher or lower than another.
Composite rankings
A composite ranking combines more than one indicator. Composite rankings should disclose:
- The indicators included.
- The weight assigned to each indicator.
- The normalization or scoring method.
- The treatment of missing data.
- The direction assigned to each metric.
- The reporting periods used.
A composite score should not be presented as objective or universal when different weights could produce a different result.
Interpretation limits
Rankings do not by themselves explain why values differ. Differences may reflect demographics, cost of living, state policy, district structure, urbanization, enrollment scale, accounting practices, assessment participation and other factors.
A rank should not be used as the sole basis for selecting a school, moving to a state, evaluating a teacher or judging an individual student.
Changes over time
A change in rank can occur even when a state’s own value changes very little. Rank movement depends on changes in every included jurisdiction.
Historical rankings should use comparable definitions. A trend should not be calculated across a methodology break without a clear warning.
Ranking corrections
Possible errors involving values, ties, ordering or calculation can be reported to support@usschoolindex.org. The page URL, disputed rank and supporting source should be included.