SEAsic

Abstract

SEAsic (score equity assessment–summary index computation) is an R package for computing and graphing a variety of indices that quantify an important aspect of test fairness, that of reported score equity. Historically, test fairness has been statistically defined as a lack of differential predication and/or a presence of measurement invariance at the item level. More recent definitions of fairness include the concept of score equity, which calls for additional subpopulation analysis at the equated, reported test score level. SEAsic allows for efficient calculation and graphing of multiple score equity assessment (SEA) indices. All indices in Huggins and Penfield (2012) can be calculated and plotted in various ways given a user-provided conversion table. SEAsic is freely available on the Comprehensive R Archive Network (CRAN). Mac, Windows, and Linux users have access to the package via downloading the appropriate version of R or RStudio from the CRAN website. Multiple examples of each index computation, variations on each index, and plot options are provided in the package manual on CRAN.