2018
DOI: 10.1177/0146621618765721
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Cognitive Diagnostic Models With Attribute Hierarchies: Model Estimation With a Restricted Q-Matrix Design

Abstract: Attribute hierarchy is a common assumption in the educational context, where the mastery of one attribute is assumed to be a prerequisite to the mastery of another one. The attribute hierarchy can be incorporated through a restricted Q matrix that implies the specified structure. The latent class–based cognitive diagnostic models (CDMs) usually do not assume a hierarchical structure among attributes, which means all profiles of attributes are possible in a population of interest. This study investigates differ… Show more

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Cited by 18 publications
(26 citation statements)
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References 31 publications
(41 reference statements)
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“…It also explains why the marginal CCRs of α 1 under Q 1 and Q 2 were substantially lower than those under Q 3 , while the marginal CCRs of the other two attributes did not differ much between Q-matrix designs. Including R T in the Q-matrix also increases the classification rates for the hierarchical cases in this study, which is consistent with the empirical findings from Tu et al (2019). The results for hierarchical attributes can also be explained from the identification perspective as discussed in Gu and Xu (forthcoming).…”
Section: Discussionsupporting
confidence: 90%
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“…It also explains why the marginal CCRs of α 1 under Q 1 and Q 2 were substantially lower than those under Q 3 , while the marginal CCRs of the other two attributes did not differ much between Q-matrix designs. Including R T in the Q-matrix also increases the classification rates for the hierarchical cases in this study, which is consistent with the empirical findings from Tu et al (2019). The results for hierarchical attributes can also be explained from the identification perspective as discussed in Gu and Xu (forthcoming).…”
Section: Discussionsupporting
confidence: 90%
“…In contrast, some studies use all 2 K − 1 = 7 q-vectors in the Q-matrix as in an independent-attribute situation (Liu and Huggins-Manley, 2016;Liu et al, 2017), referred to as the unstructured Q-matrix approach. Tu et al (2019) took the restricted Q-matrix approach in a simulation study and emphasized the importance of containing the transpose of the R-matrix in the Q-matrix. Figure 1 provided an example Q-matrix containing the transpose of the R-matrix, R T .…”
Section: Introductionmentioning
confidence: 99%
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“…The Q-matrix in the cognitive diagnostic assessment we have constructed is a matrix used to connect test items and cognitive attributes, in which 1 represents the corresponding attribute that is considered in the test item, and 0 is the opposite. The Q-matrix has built a bridge between the observable responses of students and their unobservable cognitive states (Tu et al, 2019). According to the mark of the test item in the PISA 2012 manual, the Q-matrix is obtained, as shown in Table 2.…”
Section: Q-matrixmentioning
confidence: 99%