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Computerized Adaptive Testing System of Functional Assessment of Stroke

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Maximin criterion for item selection in computerized adaptive testing.

Jyun-Hong Chen¹, Hsiu-Yi Chao²

¹Department of Psychology, National Cheng Kung University, No. 1, University Road, Tainan City, 701401, Taiwan.

Behavior Research Methods

|May 28, 2025

Summary

This summary is machine-generated.

The MaxiMin Information (MMI) criterion enhances computerized adaptive testing (CAT) by balancing item pool utilization. This new method improves test efficiency and security, especially for high-stakes assessments.

Keywords:

Computerized adaptive testing Decision theory Item selection rules Maximin information criterion Maximum Fisher information

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Area of Science:

Psychometrics
Educational Measurement
Computerized Adaptive Testing (CAT)

Background:

Information-based item selection rules (ISRs) in CAT, like maximum Fisher information (MFI), often over-utilize highly discriminating items.
This leads to unbalanced item pool usage and potential test security issues.

Purpose of the Study:

Introduce and evaluate the MaxiMin Information (MMI) criterion for item selection in CAT.
Assess MMI's ability to balance item pool utilization while maintaining trait estimation precision.

Main Methods:

Developed the MMI criterion based on decision theory, selecting items with maximum minimum information within the current confidence interval (CI) of the trait level.
Conducted five simulation studies under various conditions to compare MMI with other ISRs.

Main Results:

MMI demonstrates comparable trait estimation precision to existing ISRs.
MMI significantly improves item pool utilization balance.
MMI adapts item selection based on trait estimate precision, favoring less discriminating items for broader CIs and more discriminating items for narrower CIs.

Conclusions:

MMI is a promising ISR for CAT, particularly for high-stakes testing, due to its balanced item pool utilization and efficiency.
Recommends applying MMI with a 95% confidence level for optimal performance.
MMI offers a practical solution for enhancing CAT efficiency and security.