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Advances in Psychological Science    2013, Vol. 21 Issue (12) : 2265-2280     DOI: 10.3724/SP.J.1042.2013.02265
Research Methods |
Testlet Response Theory: An Introduction and New Developments
ZHAN Peida;Wen-Chung WANG;WANG Lijun
(1 Department of Psychology, Zhejiang Normal University, Jinhua 321004, China) (2 Assessment Research Centre, The HongKong Institute of Education, HongKong, China)
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A testlet is a cluster of items that share a common passage, stimulus, or other context, and the dependence between testlet-based item responses that caused by the common stimulus called testlet effect. This article introduced and combed the concepts of testlet, local independence and local dependence, and proposed the concepts of testlet effect in accordance with previous research. Applying standard item response models to testlet responses leaded to many problems such as biased parameter estimation and overestimation of test reliability, hence, testlet response model was introduced to deal with testlet effect better. 6 testlet response models were described in detail including Higher-order testlet model and Multilevel testlet model, and two issues were discussed: (a) the connotation of slope parameter in testlet response model is different from that in standard item response theory which is inappropriate to contrast the two directly; (b) testlet response model belongs to general multidimensional item response model and the main distinction with special multidimensional item response model is the latent factors needed to control to satisfy general local dependence hypothesis.

Keywords testlet response theory      testlet response model      multidimensional item response theory      general multidimensional item response model      general local independence     
Corresponding Authors: WANG Lijun   
Issue Date: 15 December 2013
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ZHAN Peida
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Cite this article:   
ZHAN Peida,Wen-Chung WANG,WANG Lijun. Testlet Response Theory: An Introduction and New Developments[J]. Advances in Psychological Science, 2013, 21(12): 2265-2280.
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