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Direct linkPuhan, Gautam; Kim, Sooyeon – Journal of Educational Measurement, 2022
As a result of the COVID-19 pandemic, at-home testing has become a popular delivery mode in many testing programs. When programs offer at-home testing to expand their service, the score comparability between test takers testing remotely and those testing in a test center is critical. This article summarizes statistical procedures that could be…
Descriptors: Scores, Scoring, Comparative Analysis, Testing
Download full textKim, Sooyeon; Robin, Frederic – ETS Research Report Series, 2017
In this study, we examined the potential impact of item misfit on the reported scores of an admission test from the subpopulation invariance perspective. The target population of the test consisted of 3 major subgroups with different geographic regions. We used the logistic regression function to estimate item parameters of the operational items…
Descriptors: Scores, Test Items, Test Bias, International Assessment
Kim, Sooyeon; Moses, Tim; Yoo, Hanwook – Journal of Educational Measurement, 2015
This inquiry is an investigation of item response theory (IRT) proficiency estimators' accuracy under multistage testing (MST). We chose a two-stage MST design that includes four modules (one at Stage 1, three at Stage 2) and three difficulty paths (low, middle, high). We assembled various two-stage MST panels (i.e., forms) by manipulating two…
Descriptors: Comparative Analysis, Item Response Theory, Computation, Accuracy
Moses, Tim; Kim, Sooyeon – ETS Research Report Series, 2007
This study evaluated the impact of unequal reliability on test equating methods in the nonequivalent groups with anchor test (NEAT) design. Classical true score-based models were compared in terms of their assumptions about how reliability impacts test scores. These models were related to treatment of population ability differences by different…
Descriptors: Reliability, Equated Scores, Test Items, Statistical Analysis
Kim, Sooyeon; von Davier, Alina A.; Haberman, Shelby – ETS Research Report Series, 2006
This study addresses the sample error and linking bias that occur with small and unrepresentative samples in a non-equivalent groups anchor test (NEAT) design. We propose a linking method called the "synthetic function," which is a weighted average of the identity function (the trivial equating function for forms that are known to be…
Descriptors: Equated Scores, Sample Size, Test Items, Statistical Bias
Puhan, Gautam; Boughton, Keith A.; Kim, Sooyeon – ETS Research Report Series, 2005
The study evaluated the comparability of two versions of a teacher certification test: a paper-and-pencil test (PPT) and computer-based test (CBT). Standardized mean difference (SMD) and differential item functioning (DIF) analyses were used as measures of comparability at the test and item levels, respectively. Results indicated that effect sizes…
Descriptors: Comparative Analysis, Test Items, Statistical Analysis, Teacher Certification
