A student growth percentile (SGP) describes a student’s relative growth compared to other students with similar prior test scores (their academic peers). While the calculations for SGPs are complex, they can be shared in percentile terms that are familiar to most teachers and parents. This makes SGPs a useful tool for describing student progress, providing feedback to teachers, and planning for future instruction.
SGPs are calculated using the student growth trajectories for each individual student. The trajectory for each student is projected by a formula that incorporates several variables, including the number of years since the previous testing window, the current year’s test score, and other contextual data. The resulting projections are then divided by the student’s previous test score. This result is then compared to the national median to determine a student’s SGP.
This information is then displayed in the form of a graph. This graph shows the relative performance of each student, including their average SGP, as well as a trend line showing the direction that they have been moving. The chart also displays the student’s average growth rate in both percentage and deciles. These are the two most commonly used indicators for measuring relative student performance, and they are both easily understood by students and families.
The SGP graph is available at the end of every report in Star Assessments. The graph is a useful tool for educators because it provides them with an easy-to-understand visual representation of a student’s progress in the classroom and beyond. Moreover, the SGP graph can also be downloaded and shared with other stakeholders, such as district leaders and school boards.
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