Similar Students Measure (SSR)
CCSA created the Similar Students Ranks (SSR), as a key component of our Accountability Framework. The Similar Students Rank (SSR) orders schools according to how their students perform on standardized tests compared to schools serving similar students statewide. It functions as a "proxy value-add" measure by comparing each school's performance to a prediction based on how schools with similar demographic characteristics perform.
The SSR sets a minimal bar of performance that allows for uniformly high expectations while taking into account students' backgrounds. The SSR is used as one component of CCSA's Minimum Academic Accountability Criteria, which also includes status, growth and post-secondary readiness. CCSA's Minimum Criteria do not attempt to measure or define high quality or supersede any performance goals set by the state or federal government. These criteria are only meant to determine which charters have academic outcomes that warrant academic renewal advocacy and which charters do not.
Infographic: How is the SSR calculated and what does it tell you?
How is the SSR calculated?
Each year, schools are placed in a 1-10 SSR decile ranking. The SSR attempts to identify how much value a school's educational program is adding to its students' performance. The SSR answers three questions: What is the predicted performance for a school given its student body?
- To what extent is the school missing or surpassing its predicted performance?
- How does the school's difference between predicted and actual performance compare to all other schools in the state?
These questions are answered using linear regressions for each grade and subject. The regressions control for variables that are related to academic achievement (e.g., parent education, socioeconomic status, race/ethnicity, etc.). Actual achievement minus predicted achievement produces a raw SSR score. After averaging ELA and Math in each grade, CCSA weights the score by the number of valid scores per grade to obtain one number for each school. These school-level SSR scores are ranked from lowest to highest, and allow us to place schools into the 10 decile ranks. The SSR calculation is based on publicly-reported achievement scores and tested-student demographics, as reported to the California Department of Education. CCSA does not produce SSR categories for schools that qualify for the DASS program, are Alternative, or have fewer than 30 valid scores.
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