Psychology: Techniques and Application

Psychology: Techniques and Application ›› 2017, Vol. 5 ›› Issue (6): 334-340.doi: 10.16842/j.cnki.issn2095-5588.2017.06.003

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Impact of the Format of Scoring and Degree of Testlet Effect on Test Equating for TestletBased Tests: the Perspective of Model Comparison

LI Yuqin   

  1. (College of Teacher Education, Zhejiang Normal University, Jinhua 321004, China)
  • Online:2017-06-01 Published:2017-06-01

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Abstract: A simulation study was conducted to investigate the impact of format of scoring and degree of testlet effect on test equating under polytomous IRT models. Both graded response model(GRM) and graded response testlet model(GRTM) were used to fit the equating results, meanwhile concurrent calibrate method was adopted to place item parameters that came from different tests on the same scale. Results showed that: (1) The equating results under different IRT models were influenced by different formats of scoring and degree of testlet effect. (2) When testlet effect was small than 05, GRM produced better equating results than GRTM both on discrimination and difficulty parameters regardless of formats of scoring. (3) When testlet effect was larger than 05, the equating results under different IRT models depended upon the ways of scoring, GRM produced small equating errors than GRTM for dichotomous items, while GRTM yielded small equating errors than GRM for polytomous items.

Key words: test equating; testlet model; item parameter equating; mixed items

CLC Number: 

  • B841.7
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