Data sgp is a common term used to describe student growth percentiles (SGPs) calculated from longitudinal data. SGPs provide a way to view a student’s progress in the context of their academic peers. A SGP score is based on the average of the SGPs of students who have taken the same assessment in previous years. Students are compared to their “academic peers” – all other students statewide with similar scores on previous assessments. Unlike traditional assessment reports, SGPs do not account for other factors such as demographics or program participation.
The SGPdata package, installed when you install the SGP package, includes exemplar WIDE and LONG format data sets to assist in your preparation. The lower level functions studentGrowthPercentiles and studentGrowthProjections use the WIDE data format while higher level wrapper functions such as normalizeSGPs and compareToPeers utilize the LONG format. For most analyses, you are best off using the LONG data format for your longitudinal data. It offers numerous preparation and storage benefits over the WIDE format.
How do I interpret SGPs?
Unlike traditional assessment reports, SGPs indicate a student’s growth as compared to their academic peers. A student’s academic peers are all other students statewide who have taken the same grade and subject matter assessment in previous years. A student’s SGP indicates the percentage of their academic peers that scored higher on the assessment than them.
As a result, differences between students’ SGPs from year to year need to be interpreted with caution. A difference of fewer than 10 points between SGPs should not be viewed as indicative of an increase or decrease in student performance.
In general, you should interpret a student’s SGP based on how they have performed relative to their academic peers in each of the assessed subjects. This allows you to identify whether they are on track to achieve proficiency in a given subject area and helps guide your instruction.
SGPs can also help you identify students who need extra support to improve their academic skills. For example, if you see that a student’s SGP has declined in 2024, you may want to consider implementing interventions to help them improve their academic skills.
While we encourage all districts to use SGPs for their student assessment systems, we recognize that this is a new paradigm and requires additional training for educators. We have created a collection of resources to help you get started with SGPs, including videos and webinars on how to interpret and use the student growth percentiles. To access these resources, please visit the Student Growth District and School Resources page. The resources include video presentations, PowerPoint slides, and a guide to the student growth percentiles. This information is also available in a printable PDF document. A training calendar is also available for district and school staff to find out when SGP trainings are offered. The trainings are free of charge. You can also request a session for your district or school by emailing sgp@ospi.org.