Data sgp is a tool for running SGP analyses using the open source R software. Using the data sgp tool requires some familiarity with using R. The R software is available for Windows, OSX, and Linux and is freely downloadable. Detailed documentation on the SGP package can be found here.
The sgpData_LONG dataset provides student growth information for up to two years of testing. The sgpData_LONG data set contains the following variables for each student: VALID_CASE, CONTENT_AREA, YEAR, ID, SCALE_SCORE, GRADE, and ACHIEVEMENT_LEVEL (on if required to run SGP analyses). This dataset is only available for students who have taken at least one assessment in each of the three content areas.
A student’s SGP score is based on their performance compared to that of their “academic peers.” Academic peers are identified from all students statewide who scored similarly on the same MCAS test in prior years and take an equivalent assessment in the current year. This allows the comparison of the student’s current test score to their previous score and indicates whether or not they have improved their skills. A student’s SGP is reported as a percentile rank – the higher the number, the more the student has improved their skills compared to their academic peers.
Unlike scaled scores, SGP scores can be meaningfully compared across grade levels. However, it is important to remember that percentageile ranks are calculated anew each year, and differences between percentiles need to be interpreted with caution. In addition, because SGP scores are based on trends in statewide student performance, they can vary slightly from year to year.
For example, a student who has a high SGP score in 2023 may have an even lower SGP score in 2024 as a result of the Covid-19 pandemic or other factors. This variation in SGPs between years can make it difficult to compare the performance of schools and districts.
SGPs are meant to be considered along with scaled scores and achievement levels as part of a holistic picture of student learning. For more information on how to interpret SGPs, see the technical resources on the Student Growth School and District Resources webpage.
OSPI recognizes that interpreting SGPs can be confusing and that the model is complex. We also know that teachers have many responsibilities and that dedicating time to training on SGPs may be low priority. We are committed to providing the tools and guidance needed for schools and districts to use this tool in the best way possible. Please visit the SGP technical resources page for videos and additional materials. Thanks! We appreciate your help as we continue to build this resource. Please contact us if you have questions or suggestions. We are always looking for new ideas and ways to improve our tools for assisting you in understanding SGPs. The more feedback we receive from teachers and schools, the better we can provide helpful support and tools for you. You can reach us via email or by using the chat box below.