How to Calculate Student Growth Percentiles (SGP)

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Student growth percentiles (SGP) are a way to report the amount of growth a student has made over time and to compare that growth with their academic peers nationwide. SGPs use the historical growth trajectories of Star examinees to determine what their future growth might look like and what they need to do to reach or maintain proficiency. SGPs provide an accurate picture of a students progress toward meeting state standards because they are based on all available test data and use the most recent assessments for comparison. SGPs also allow districts to customize their reporting by using different testing windows, so that the SGP results reported reflect the growth students have made compared to the average of those tested in the same window.

A student’s SGP is calculated by comparing their most recent assessment scores with the previous test score from a prior assessment in the same subject and grade. SGPs can be analyzed by a number of ways and can be found in the Star Growth Report and on each student’s report card. For example, a teacher can use SGP to compare the growth of all of their students against that of their academic peers within the district, across schools, or nationally.

SGPs are calculated using a standard statistical model that compares a student’s current test score with the test scores of their academic peers nationwide. This process is known as standardization. Using this method, the model is able to estimate the likelihood that a particular test score will occur for a given student, and thus can make an accurate prediction of how much a student might grow over time. The SGP is then converted to a percentile, which allows teachers and parents to easily compare the student’s progress with their academic peers. The standardization method also enables teachers to make better-informed decisions about the instructional needs of their students by providing them with information that is relevant and meaningful to their individual students. This is why it is so important to keep the standardization process accurate and up-to-date. To this end, the state has established procedures to ensure that SGPs are updated regularly and that SGPs represent the latest growth trends for students in Washington.