What is Data SGP?
Data sgp is a database of longitudinal student assessment data that allows teachers and administrators to see how their students are progressing academically and identify areas where additional support may be necessary. This data is generated by comparing students’ current test scores with those of their academic peers nationwide who have similar prior achievement levels using a model that considers student demographics and prior performance. SGP also provides growth projections that show what students’ trajectories are likely to lead to, including the estimated amount of growth needed for them to reach/keep-up with their academic peers in order to maintain proficiency.
Developed by Damian Betebenner, SGP estimates a student’s growth relative to the average of their academic peers based on historical data from their standardized test scores. The sgpData package, which is installed with the SGP software, includes an exemplar WIDE format data set (sgpData) and a LONG format sgpData_LONG dataset that models the format of the time dependent variables used by the lower level studentGrowthPercentiles and studentGrowthProjections functions. The sgpData vignette describes how to work with these data sets to create SGP analyses.
Standardized test score measures are imperfect measures of latent achievement traits, and the estimation process for creating these estimates can introduce large estimation errors into the final estimate (Akram, Erickson & Meyer 2013; Lockwood & Castellano 2015). SGP is a system that uses longitudinal student assessment data to produce statistical growth plots that account for the estimated error in students’ prior and current test scores and provide more accurate measures of a student’s actual academic progress than unadjusted test score measures.
SGP scores are calculated by comparing a students’ current test score against the average of the highest and lowest performing academic peers. SGPs are available in two formats: Window Specific SGP, which can be compared or reported between different windows of time and Current SGP, which is intended to serve as a quick check-in for a student’s progression over time.
The SGP analysis results are saved in a spreadsheet document containing all of the students’ sgpData output for a given period of time. These spreadsheets can then be reviewed and analyzed by teachers and administrators to help them understand the meaning of each individual sgpData output.
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