California parents have yet another way to assess how their local schools are doing.
The California Charter Schools Association has developed a new metric, called a Similar Student Measure [PDF], to assess how a school's students perform on state tests compared to other schools serving similar students. The measure is used to identify which schools overperform or underperform over a three-year period by comparing a school's Academic Performance Index to a predicted API that controls for the impact of students' background in those schools.
The measure was developed to assess how charter schools are doing compared to regular public schools, but could have wider utility for the majority of schools in California.
They claim their methodology is superior to the state's "similar schools ranking".