Student Growth Percentile (SGP)

The Student Growth Percentile (SGP), developed by Dr. Damian Betebenner, provides the latest in growth projections, including Betebenner's well-known catch-up, keep-up growth projections to provide longitudinal SGP data.

SGP compares a student's growth to that of his or her academic peers nationwide. These peers are students in the same grade with a similar achievement history on Star assessments.

SGP is measured on a 1–99 scale. Lower numbers indicate lower relative growth, and higher numbers indicate higher relative growth. For instance, if a student has an SGP of 75, it means the student has shown more growth than 75 percent of his or her academic peers. Teachers and administrators can use SGP scores to determine if students grew more than, less than, or as much as expected.

SGP is calculated using scores from a combination of Star Enterprise and Star progress monitoring tests taken during Fall, Winter, and Spring testing windows, allowing the user to see SGP for a Fall–Winter window, Fall–Spring window, etc. The date ranges for these testing windows are:

  • Fall: August 1–November 30
  • Winter: December 1–March 31
  • Spring: April 1–July 31
We provide this information in two formats: Window Specific SGP (see the next section), whose purpose is to compare or report student growth between specific time frames, and Current SGP, whose purpose is to provide the most current SGP scores available for a student as a quick check-in for progression of growth.

Current SGP is calculated for students who have taken at least two tests within different testing windows. It uses the most recent test (within the past 18 months) and at least one prior test from an earlier testing window (Fall, Winter, or Spring; the dates for these windows are static and need not correspond to a school or district's school year). The assessments used to calculate SGP are pictured in the table below. Additional rules are considered if there is more than one assessment in a prior window.

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SGP utilizes the historical growth trajectories of Star examinees to map out what the range of potential growth trajectories for each student will lead to, including what growth is necessary for each student to reach/maintain proficiency. SGP is updated regularly so that students projections are based upon the most recent data available.

Student Growth Percentiles are currently not available for the following students:

  • Star Math: not available in Star Math Algebra and Star Math Geometry assessments
  • Star Math Spanish: students in grade K, students in grades 9 and higher
  • Star Reading Spanish: students in grade K, students in grades 9 and higher

For additional information about SGPs, see Student Growth Percentile in Star Assessments®.

Note: If you are creating district screening windows to be used for "Window to Window SGPs," they will need to align with our SGP windows.

SGP can be found on the following reports:

Window Specific SGP

Window Specific SGPs are determined (during report customization) by selecting a current or prior school year as well as the SGP window time frames that you want to view growth for. The tests used to determine Window Specific SGPs are based on the following rules:

  • Fall Window: First test taken
  • Winter Window: Test taken closest to 1/15
  • Spring Window: Last test taken

In the Star Growth Report, Window Specific SGPs are calculated when you select a prior or current school year during the report customization (in the Timeframe drop-down list).

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