Data SGP is an open-source software package that enables researchers to analyze and visualize student growth data. Primarily utilized with R software environment running on various operating systems, we suggest taking some time to familiarize yourself with SGP analyses before proceeding.

Installing and running the SGP software requires your computer to have an operating system compatible with it – currently Windows, OSX and Linux are supported – but please keep in mind that an R programming language version compatible with your operating system may also need to be installed on it.

The SGP software comprises two major components: a data management component and an analytical interface. The former stores student growth information in a database while providing an intuitive query-and-analyse interface; its successor allows researchers to generate reports and charts based on student growth data.

The SGP Data Management component is built upon PostgreSQL, an open-source database management system. It resides on an Apache web server and can be accessed over HTTP. Data is organized into tables with relational schema, in addition to several specialized tables storing student information or important details that allow us to generate statistical reports and graphs.

PostgreSQL stands out from many other database management systems as being capable of handling large volumes of data, which SGP takes advantage of extensively. The data management component can accommodate more than a million records in one table while its analytical interface can process thousands at the same time.

Users seeking access to SGP data must obtain a valid account from an approved provider – typically, this involves being connected to a school or district-level organization that has purchased an SGP license, and which will then provide users with username and password credentials to log on and access SGP information.

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SGP data sets come in two formats, WIDE and LONG. WIDE format data represents each row as representing an individual student while each column displays variables associated with them at various times. When you install SGP software, the SGPdata package provides two sample WIDE and LONG data sets (sgpData_WIDE and sgpData_LONG) to aid your setup process.

It is essential to keep in mind when interpreting SGP data that the student growth percentiles are relative measures compared to others who have completed previous test sections, meaning even high-achieving students may see variations between tests due to differing levels of performance on each section of tests.