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Download full textLu, Ru; Haberman, Shelby; Guo, Hongwen; Liu, Jinghua – ETS Research Report Series, 2015
In this study, we apply jackknifing to anchor items to evaluate the impact of anchor selection on equating stability. In an ideal world, the choice of anchor items should have little impact on equating results. When this ideal does not correspond to reality, selection of anchor items can strongly influence equating results. This influence does not…
Descriptors: Test Construction, Equated Scores, Test Items, Sampling
Guo, Hongwen; Liu, Jinghua; Curley, Edward; Dorans, Neil – ETS Research Report Series, 2012
This study examines the stability of the "SAT Reasoning Test"™ score scales from 2005 to 2010. A 2005 old form (OF) was administered along with a 2010 new form (NF). A new conversion for OF was derived through direct equipercentile equating. A comparison of the newly derived and the original OF conversions showed that Critical Reading…
Descriptors: Aptitude Tests, Cognitive Tests, Thinking Skills, Equated Scores
Liu, Jinghua; Sinharay, Sandip; Holland, Paul W.; Feigenbaum, Miriam; Curley, Edward – Educational Testing Service, 2009
This study explores the use of a different type of anchor, a "midi anchor", that has a smaller spread of item difficulties than the tests to be equated, and then contrasts its use with the use of a "mini anchor". The impact of different anchors on observed score equating were evaluated and compared with respect to systematic…
Descriptors: Equated Scores, Test Items, Difficulty Level, Error of Measurement
Liu, Jinghua; Zhu, Xiaowen – ETS Research Report Series, 2008
The purpose of this paper is to explore methods to approximate population invariance without conducting multiple linkings for subpopulations. Under the single group or equivalent groups design, no linking needs to be performed for the parallel-linear system linking functions. The unequated raw score information can be used as an approximation. For…
Descriptors: Raw Scores, Test Format, Comparative Analysis, Test Construction
Haberman, Shelby J.; Guo, Hongwen; Liu, Jinghua; Dorans, Neil J. – ETS Research Report Series, 2008
This study uses historical data to explore the consistency of SAT® I: Reasoning Test score conversions and to examine trends in scaled score means. During the period from April 1995 to December 2003, both Verbal (V) and Math (M) means display substantial seasonality, and a slight increasing trend for both is observed. SAT Math means increase more…
Descriptors: College Entrance Examinations, Thinking Skills, Logical Thinking, Scaling
Liu, Jinghua; Low, Albert C. – ETS Research Report Series, 2007
This study applied kernel equating (KE) in two scenarios: equating to a very similar population and equating to a very different population, referred to as a distant population, using SAT® data. The KE results were compared to the results obtained from analogous classical equating methods in both scenarios. The results indicate that KE results are…
Descriptors: College Entrance Examinations, Equated Scores, Comparative Analysis, Evaluation Methods
