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Download full textTopczewski, Anna; Cui, Zhongmin; Woodruff, David; Chen, Hanwei; Fang, Yu – ACT, Inc., 2013
This paper investigates four methods of linear equating under the common item nonequivalent groups design. Three of the methods are well known: Tucker, Angoff-Levine, and Congeneric-Levine. A fourth method is presented as a variant of the Congeneric-Levine method. Using simulation data generated from the three-parameter logistic IRT model we…
Descriptors: Comparative Analysis, Equated Scores, Methods, Simulation
Chen, Hanwei; Cui, Zhongmin; Zhu, Rongchun; Gao, Xiaohong – ACT, Inc., 2010
The most critical feature of a common-item nonequivalent groups equating design is that the average score difference between the new and old groups can be accurately decomposed into a group ability difference and a form difficulty difference. Two widely used observed-score linear equating methods, the Tucker and the Levine observed-score methods,…
Descriptors: Equated Scores, Groups, Ability Grouping, Difficulty Level
ACT, Inc., 2007
ACT conducts the only nationwide curriculum survey that empirically identifies current instructional practices and postsecondary expectations in order to develop tests that measure critical skills and knowledge. Every three years, it surveys thousands of middle school/junior high school, secondary, and postsecondary teachers in English/writing,…
Descriptors: Basic Skills, High Schools, Teaching Methods, National Surveys
ACT, Inc., 2010
This report presents the findings for private four-year colleges that participated in ACT's 2010 What Works in Student Retention survey. The report contains information pertinent to only these institutions. Appended are: (1) Data for Private Four-Year Colleges and Universities; and (2) What Works in Student Retention: Instrument. (Contains 15…
Descriptors: Private Colleges, Academic Persistence, School Holding Power, College Students
ACT, Inc., 2010
This report presents the findings for public four-year colleges and universities that participated in ACT's 2010 What Works in Student Retention survey. The report contains information pertinent to only these institutions. Appended are: (1) Data for Public Four-Year Colleges and Universities; and (2) What Works in Student Retention: Instrument.…
Descriptors: Public Colleges, Academic Persistence, School Holding Power, College Students
