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The classes, functions and data within the SGP package are used to calculate student growth percentiles and percentile growth projections/trajectories using large scale, longitudinal assessment data. Quantile regression is used to estimate the conditional density associated with each student's achievement history. Percentile growth projections/trajectories are calculated using the derived coefficient matrices and show the percentile growth needed to reach future achievement targets.\n\n\n# Installation\n\n## From [CRAN](https://CRAN.R-project.org/package=SGP)\n\nTo install the latest stable release of SGP from [CRAN](https://CRAN.R-project.org/package=SGP)\n\n```R\n\u003e install.packages(\"SGP\")\n```\n\n## From [Github](https://github.com/CenterForAssessment/SGP/)\n\nTo install the development release of SGP from [GitHub](https://github.com/CenterForAssessment/SGP/):\n\n```R\n\u003e devtools::install_github(\"CenterForAssessment/SGP\")\n```\n\n\n# Resources\n\n* [SGP GitHub Pages](https://sgp.io)\n* [CRAN Repo](https://CRAN.R-project.org/package=SGP)\n* [Norm- and Criterion-Referenced Student Growth](https://github.com/CenterForAssessment/SGP_Resources/blob/master/articles/Betebenner_EMIP_2009.pdf)\n\n\n# Contributors\n\nThe SGP Package is crafted with :heart: by:\n\n* [Damian Betebenner](https://github.com/dbetebenner)\n* [Adam R. Van Iwaarden](https://github.com/adamvi)\n* [Ben Domingue](https://github.com/ben-domingue)\n* [Yi Shang](https://github.com/shangyi)\n\nWe love feedback and are happy to answer questions.\n\n\n# References\n\nBetebenner, D. W., VanIwaarden, A., Domingue, B., and Shang, Y. (2025). SGP: Student Growth Percentiles \u0026 Percentile Growth Trajectories.\n\nR Core Team (2025). R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. URL\nhttps://www.R-project.org/.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcenterforassessment%2Fsgp","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fcenterforassessment%2Fsgp","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcenterforassessment%2Fsgp/lists"}