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IRT Characteristic Curve Linking Methods Weighted by Information for Mixed-Format Tests
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Shaojie Wang; Won-Chan Lee; Minqiang Zhang; Lixin Yuan – Applied Measurement in Education, 2024
To reduce the impact of parameter estimation errors on IRT linking results, recent work introduced two information-weighted characteristic curve methods for dichotomous items. These two methods showed outstanding performance in both simulation and pseudo-form pseudo-group analysis. The current study expands upon the concept of information…
Descriptors: Item Response Theory, Test Format, Test Length, Error of Measurement
A Comparison of Strategies for Smoothing Parameter Selection for Mixed-Format Tests under the Random Groups Design
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Liu, Chunyan; Kolen, Michael J. – Journal of Educational Measurement, 2018
Smoothing techniques are designed to improve the accuracy of equating functions. The main purpose of this study is to compare seven model selection strategies for choosing the smoothing parameter (C) for polynomial loglinear presmoothing and one procedure for model selection in cubic spline postsmoothing for mixed-format pseudo tests under the…
Descriptors: Comparative Analysis, Accuracy, Models, Sample Size
Exploring Alternative Test Form Linking Designs with Modified Equating Sample Size and Anchor Test Length. Research Report. ETS RR-13-02
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Wang, Lin; Qian, Jiahe; Lee, Yi-Hsuan – ETS Research Report Series, 2013
The purpose of this study was to evaluate the combined effects of reduced equating sample size and shortened anchor test length on item response theory (IRT)-based linking and equating results. Data from two independent operational forms of a large-scale testing program were used to establish the baseline results for evaluating the results from…
Descriptors: Test Construction, Item Response Theory, Testing Programs, Simulation
An Alternative Data Collection Design for Equating with Very Small Samples. Research Report. ETS RR-08-11
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Puhan, Gautam; Moses, Tim; Grant, Mary; McHale, Fred – ETS Research Report Series, 2008
A single group (SG) equating design with nearly equivalent test forms (SiGNET) design was developed by Grant (2006) to equate small volume tests. The basis of this design is that examinees take two largely overlapping test forms within a single administration. The scored items for the operational form are divided into mini-tests called testlets.…
Descriptors: Data Collection, Equated Scores, Item Sampling, Sample Size
Issues in Creating and Reporting Concordance Results Based on Equipercentile Methods.
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Pommerich, Mary; Hanson, Bradley A.; Harris, Deborah J.; Sconing, James A. – 1999
This paper focuses on methodological issues in applying equipercentile equating methods to pairs of tests that do not meet the assumptions of equating. This situation is referred to as a concordance situation, as opposed to an equating situation, and the end result is a concordance table that gives "comparable" scores between the tests.…
Descriptors: College Entrance Examinations, Comparative Analysis, Equated Scores, Error of Measurement
An Empirical Study of the Properties of Two Estimates of Decision-Consistency Used with Two Types of Teacher-Constructed Classroom Tests.
Macpherson, Colin R.; Rowley, Glenn L. – 1986
Teacher-made mastery tests were administered in a classroom-sized sample to study their decision consistency. Decision-consistency of criterion-referenced tests is usually defined in terms of the proportion of examinees who are classified in the same way after two test administrations. Single-administration estimates of decision consistency were…
Descriptors: Classroom Research, Comparative Testing, Criterion Referenced Tests, Cutting Scores