The Problem with Single-Number Rankings
School rankings are intellectually satisfying and practically dangerous. They compress an enormously complex institutional reality into a single ordinal number — and in doing so, they hide nearly everything important. A school ranked 47th in a state might be precisely the right school for one family and entirely wrong for another. Context matters. Your child's specific needs matter. The ranking number captures neither.
That said, rankings aren't worthless — they're a starting point. The question is which metrics underlying those rankings deserve weight, and which are noise dressed up as signal.
Metrics That Correlate With Outcomes: The Strong Evidence Base
Student Growth Percentile (SGP)
As discussed in our test score interpretation guide, SGP measures how much students improve relative to academically similar peers. An SGP of 70 means: this school grew its students more than 70% of schools serving students who started at the same level. This is the single best publicly available proxy for teaching quality.
Research support: Multiple studies have found SGP predicts long-term student outcomes (graduation rates, college enrollment) better than proficiency rates when demographic controls are applied.
Chronic Absenteeism Rate
Students missing 10% or more of school days (roughly 18 days in a 180-day year) are considered chronically absent. The national rate has risen sharply since the pandemic, from ~15% pre-2020 to over 26% in 2022–23.
Chronic absenteeism is a leading indicator — it predicts academic failure and dropout risk better than test scores in early grades. A school with 25% chronic absenteeism has a culture or climate problem regardless of how its test scores look. A school with 8% absenteeism is doing something right in terms of student engagement.
Teacher Experience Distribution
Research consistently finds that teachers improve substantially in their first three to five years of teaching, then plateau. Schools with high percentages of first-year teachers (above 20%) are systematically providing lower instructional quality than their test scores suggest. High teacher turnover is a massive hidden cost that rankings almost never capture.
Graduation Rate (Adjusted)
The four-year adjusted cohort graduation rate (ACGR) tracks the percentage of students who graduate in four years from the cohort that started 9th grade together. This is better than older graduation rate methods that were easily manipulated. Strong high schools have ACGRs above 90%; schools below 75% have serious structural problems.
Metrics That Sound Important But Are Heavily Confounded
Proficiency Rates
Covered extensively above: proficiency rates tell you more about neighborhood income than school quality. Use them as a rough geographic comparator, not as a school quality measure.
Per-Pupil Expenditure
More money doesn't automatically mean better education, but severe underfunding does harm outcomes. The research suggests diminishing returns above roughly $12,000–$15,000 per pupil annually, but underfunding below $8,000 per pupil in today's dollars is associated with worse outcomes. Use this metric to flag schools in fiscal distress, not to rank by quality.
College Acceptance Rates
High college acceptance rates at high schools are almost entirely demographic. A high school where 85% of parents have college degrees will naturally have near-universal college application rates. This metric says almost nothing about what the school did for its students.
Metrics That Are Underused But Valuable
- Suspension rate by race/ethnicity: Racial disparities in discipline are a strong signal of inequitable school culture, even in schools with high overall test scores.
- Counselor-to-student ratio: The national average is approximately 1:415; the ASCA-recommended ratio is 1:250. Schools well below the recommended ratio systematically underserve students in crisis.
- AP course access rate: What percentage of the student body is enrolled in at least one AP course? This measures program equity, not just the existence of AP classes.
- English Learner reclassification rate: For schools serving significant EL populations, how quickly students progress to English proficiency reflects instructional quality and program strength.
Building Your Own Ranking: A Practical Framework
Rather than deferring to someone else's weighting choices, build your own evaluation matrix. Assign weights based on what matters to your family:
- Identify your top three priorities (academic rigor, special education support, arts programs, diversity, etc.)
- For each priority, find the specific metric that best measures it (growth percentile for rigor, IEP % served for special ed, etc.)
- Look up those specific metrics for schools you're considering using MySchoolPeek's comparison tool
- Create a simple weighted score using only the metrics that match your priorities
This process takes 30 minutes and produces a ranking far more relevant to your family than any published list.