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Download full textSteedle, Jeffrey; Pashley, Peter; Cho, YoungWoo – ACT, Inc., 2020
Three mode comparability studies were conducted on the following Saturday national ACT test dates: October 26, 2019, December 14, 2019, and February 8, 2020. The primary goal of these studies was to evaluate whether ACT scores exhibited mode effects between paper and online testing that would necessitate statistical adjustments to the online…
Descriptors: Test Format, Computer Assisted Testing, College Entrance Examinations, Scores
Li, Dongmei; Yi, Qing; Harris, Deborah – ACT, Inc., 2017
In preparation for online administration of the ACT® test, ACT conducted studies to examine the comparability of scores between online and paper administrations, including a timing study in fall 2013, a mode comparability study in spring 2014, and a second mode comparability study in spring 2015. This report presents major findings from these…
Descriptors: College Entrance Examinations, Computer Assisted Testing, Comparative Analysis, Test Format
Peer reviewedHarris, Deborah J. – Applied Psychological Measurement, 1991
Effects of passage and item-scrambling on equipercentile and item-response theory equating were investigated using 2 scrambled versions of the American College Testing Program Assessment for approximately 25,000 examinees. Results indicate that using a base-form conversion table with a scrambled form affects the individual examinee level. (SLD)
Descriptors: College Entrance Examinations, Comparative Testing, Context Effect, Equated Scores
von Davier, Alina A., Ed.; Liu, Mei, Ed. – ETS Research Report Series, 2006
This report builds on and extends existent research on population invariance to new tests and issues. The authors lay the foundation for a deeper understanding of the use of population invariance measures in a wide variety of practical contexts. The invariance of linear, equipercentile and IRT equating methods are examined using data from five…
Descriptors: Equated Scores, Statistical Analysis, Data Collection, Test Format
