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Welcome to the Massachusetts MEAP/WIDA SGP Analysis Wiki. This wiki supplies technical details associated with the calculation of student growth percentiles and percentile growth trajectories from Massachusetts MEAP/WIDA state assessment data using the R Software Environment in conjunction with the SGP Package. If you are new to R or SGP analyses in general, a better place to start is with an overview of R and the SGP Package.

Broadly, the SGP analysis of the longitudinal student data takes place in two steps:

1. Data Preparation
2. Data Analysis

Those familiar with data analysis are aware that the bulk of the effort in the above two step process lies with Step 1: Data Preparation. Following thorough data preparation, data analysis using the SGP Package takes clean data and makes it as easy as possible to calculate, output, and visualize the results from SGP analyses.