Data SGP – The Easiest Way to Analyze Longitudinal Student Assessment Data
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The sgptData_LONG data set, which is installed when you install the SGP package, contains an exemplar WIDE format of longitudinal student assessment data with 7 variables: VALID_CASE, CONTENT_AREA, YEAR, ID, SCALE_SCORE, GRADE and ACHIEVEMENT_LEVEL. The lower level functions studentGrowthPercentiles and studentGrowthProjections use the WIDE data format while higher level wrapper functions (summarySGP) require the LONG format of longitudinal data.
There are two common formats for longitudinal (time dependent) student assessment data: WIDE and LONG. The WIDE data format contains the same data for each case/student in each row, while in the LONG data format, time dependent data for each student is spread across multiple rows in the data set.
It is best to prepare your longitudinal student assessment data in the LONG format, since it will have numerous preparation and storage benefits over WIDE data. However, there are some cases in which it may be preferable to use the WIDE format for a one-off analysis. In such cases, you should be aware of the limitations of the lower level SGP analyses that use WIDE data and consider using the higher level wrapper functions instead.
If you’re planning on analyzing data in both formats, the easiest way to do so is by using the SGPdata package. It contains a function to convert between the two formats as well as a utility for creating longitudinal plots and other SGP analyses.
In addition to converting between data formats, the SGPdata package includes an exemplary long and wide data set in the sgptData_LONG format that can be used for testing purposes. This data set is similar to the sgpData_LONG data set except that it does not contain demographic variables and an additional DATE variable.
The SGPdata package is a free and open source software tool that can be downloaded from the CRAN website. It is easy to use and provides a quick and convenient way to perform longitudinal student growth analysis in R. It has been extensively tested and is supported by a large community of users. The documentation includes detailed examples of how to use the various functions. The SGPdata package can be installed and run from a local or remote machine, either in a graphical user interface (GUI) or scripting mode. The GUI is a simple and intuitive application that allows users to enter their data and run the SGP algorithms in an interactive environment. Alternatively, the scripting mode is a convenient and powerful alternative to the GUI for more advanced uses of the program.