Data sgp is a new feature in the Star website that displays student growth percentiles (SGP) based on your selected date range. These SGPs show the range of possible future trajectories for your student and how much additional growth is required to reach/maintain proficiency. SGP uses your students historical growth trajectories from past Star assessments and compares them to the growth trajectories of academic peers nationwide.
SGPs provide information about student progress in a way that is easy for teachers and parents to understand. They can serve as a starting point for discussions about how to support student learning. They can also help educators identify trends that may indicate a need for changes in instructional strategies or other school practices.
The sgpData_LONG data set provides an anonymized, panel data set comprising 5 years of annual, vertically scaled assessment data in WIDE format. This exemplar data set models the format for data used with the lower level studentGrowthPercentiles and studentGrowthProjections functions. The first column in sgpData provides a unique student identifier and the following columns provide the grade level and time associated with each of the students assessment occurrences.
Using LONG formatted data with SGP analyses is more straight forward than using wide formatted data because the higher level SGP functions are designed to operate with this data type. These higher level functions also typically assume that the embedded SGPstateData meta-data is in the correct format.
If you use the sgpData_LONG data sets for your SGP analyses, it is important that you have the correct formatted state-level meta-data in your SGPstateData file. If you do not have the appropriate state-level SGPstateData file, then you will get an error when attempting to run the studentGrowthPercentiles or studentGrowthProjections functions.
To ensure that you have the correct formatted state-level SGPstateData file, please consult the sgpData_LONG Data Analysis Vignette. The sgpData_LONG Data Vignette also includes instructions for creating the necessary state-level SGPstateData file.
The sgpData_LONG Vignette describes the structure of the sgpData_LONG and sgptData_LONG data sets. It also explains how the lower-level SGP functions operate with these data sets. This vignette is a great place to start when working with the SGP package. In addition to the sgpData_LONG vignette, there are several other vignettes in the SGP package that describe various SGP analyses. Please refer to the SGP package documentation for more detailed information about how to use these vignettes.