OSAS, SY 2024-25
All grades, all students. % Proficient.English Language Arts
36.2%
State avg 43.0%
District avg 36.2%
County avg 44.2%
-6.7pp since 2023-24
Mathematics
28.5%
State avg 31.8%
District avg 28.5%
County avg 34.0%
-7.3pp since 2023-24
Science
20.2%
State avg 30.2%
District avg 20.2%
County avg 31.2%
-10.8pp since 2023-24
What this means: On the OSAS, Oregon's statewide test, about 36 of every 100 students at this school read and write at grade level, about 29 of 100 do math at grade level, and about 20 of 100 are at grade level in science. Across all Oregon schools, those numbers are about 43, 32, and 30. Reading and writing scores are down about 7 points since 2023, while math scores are down about 7 points and science scores are down about 11 points.
BeatsExpectations
Demographically-adjusted score · methodologyTier
UNDERPERFORMING
Bottom 10% of OR schools after controlling for student poverty
Actual proficiency
32.4%
composite math + reading, all grades
Predicted
48.3%
based on OR schools with similar FRL share
Beats by
-15.9pp
below demographic expectation
What this means: About 32% of students here test proficient in math and reading, below the roughly 48% typical for Oregon schools with a similar share of low-income students. BeatsExpectations compares each school with others at the same poverty level, not by raw scores, so a school lands here when its results trail those comparable schools, which is not the same as having low scores. A higher-scoring school can still fall in this tier if similar schools score higher still.
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual.
How this is calculated →What is OSAS?
OSAS is the statewide standardized test administered by Oregon public schools.
What does "% Proficient" mean?
It is the share of students at the school who performed at grade level or above on the test, summed across the top two of four performance levels. A higher number is better.
What does 36.2% mean for English Language Arts at Corbett School?
It means about 36.2 percent of students tested at Corbett School performed at grade level or above on the OSAS English Language Arts test in 2024-25. The statewide average for Oregon that year was 43.0%. The other students fell into the lower performance levels.
How is the state average calculated?
It is a weighted average, not a simple average of each school's number. We multiply each public school's score by how many of its students tested, add those together for all schools in Oregon, and divide by the total students tested that year. This way a big school with 1,500 students counts more than a small school with 50 students, which is the right way to ask "how did the typical student do this year?". District and county averages on this page use the same method, just scoped to that district or county.
Where does this data come from?
Oregon Department of Education, Oregon Statewide Assessment System (OSAS) — Smarter Balanced for ELA + Math, OAKS Science. School-level "Total Population (All Students)" subgroup, all grades combined, from the ODE Assessment Group Reports. Headline metric is the cumulative Level 3 + Level 4 rate (SBAC "Met or Exceeded Standard").
How often is it updated?
OSAS is administered once a year (spring). Results are released by the state in the summer or early fall. We refresh this page after each annual release.
