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Detection of Test Speededness Using Change-Point Analysis.

Can Shao1, Jun Li2, Ying Cheng3

  • 1Department of Psychology, University of Notre Dame, 118 Haggar Hall, Notre Dame, IN, 46556, USA.

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Summary

This study introduces a change-point analysis (CPA) method to detect test speededness and identify when examinees start speeding. This approach improves ability estimation by removing speeded responses, benefiting test design and assessment accuracy.

Keywords:
change-point analysisfalse discovery rateitem response theorylikelihood ratio statistictest speededness

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Area of Science:

  • Statistics
  • Psychometrics
  • Educational Measurement

Background:

  • Change-point analysis (CPA) is a statistical technique for detecting abrupt shifts in data.
  • Test speededness, where examinees rush to finish, can compromise ability estimation.
  • Existing methods may not precisely identify the onset of speeding behavior.

Purpose of the Study:

  • To propose a novel procedure using CPA to detect test speededness.
  • To classify examinees as speeded or non-speeded.
  • To identify the specific point at which examinees begin to speed.

Main Methods:

  • Utilized change-point analysis (CPA) to develop a procedure for detecting speededness in test data.
  • Simulated data to evaluate the efficiency of the proposed method.
  • Applied the procedure to a real-world dataset for validation.

Main Results:

  • The CPA-based procedure effectively identifies speeded examinees and the precise point of speeding.
  • Simulation studies confirmed the procedure's efficiency.
  • Removing speeded responses significantly improved ability estimation accuracy.

Conclusions:

  • The proposed CPA method offers a robust approach to detecting and addressing test speededness.
  • Identifying the speeding point allows for more accurate ability estimation by selectively removing problematic responses.
  • This methodology has implications for optimizing test length and improving assessment validity.