## Q矩陣錯誤設定在G-DINA模型下對參數估計和辨識率之影響 The Effects of Q-matrix Misspecification on Parameter Estimates and Classification Accuracy of the Generalized DINA Model

2013

Po-Fu Kuo
##### Abstract

This study investigates the influence of different types of Q-matrix misspecification on parameter estimates and classification accuracy of the G-DINA model. In particular, underspecification and overspecification are the two types of Q-matrix misspecification under consideration. Furthermore, mean absolute deviation and classification accuracy index are used as the indices for parameter estimates and classification accuracy, respectively. Our results show that underspecification has a great impact on item parameter estimates, as well as on the probability of answering an item correctly for some latent mastery patterns. In contrast, overspecification has little impact on parameter estimates. Classification accuracy is also influenced by underspecification,with interactions with sample sizes as well as the distribution of underlying cognitive attribute patterns.
##### Keywords
Q矩陣錯誤設定, G-DINA模型, 辨識率, Q-matrix misspecification, G-DINA model, Classification accuracy