arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2105.09495stat.CO
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结合随机优化与变分推断的可扩展贝叶斯 DINA Q矩阵估计方法

Scalable Bayesian Approach for the DINA Q-matrix Estimation Combining Stochastic Optimization and Variational Inference

Motonori Oka, Kensuke Okada

AI总结:

针对 DINA 模型中大规模 Q矩阵估计难题,提出融合随机优化与变分推断的可扩展贝叶斯框架,以最大化边际似然,并验证其高速、准确且稳健。

摘要:

诊断分类模型(DCMs)提供了统计工具,用于考察受访者优势与弱点的细粒度属性。然而,当预先定义的题目—属性关系(被编码为 Q矩阵)出现错误设定时,诊断准确性会下降。为防止此类错误设定,方法学研究者近期开发了若干贝叶斯 Q矩阵估计方法,以获得更大的估计灵活性。但在具有大量属性和题目的大规模评估中,这些方法会变得不可行。本研究聚焦于确定性输入、噪声“与”门(DINA)模型,并提出了一个用于 Q矩阵估计的新框架,以寻找具有最大边际似然的 Q矩阵。基于该框架,我们通过构建一种利用随机优化和变分推断的迭代算法,开发了可扩展的 DINA Q矩阵估计算法。模拟与实证研究表明,所提出的方法实现了高速计算、良好的准确性,以及对潜在错误设定(如初始值选择和超参数设置)的稳健性。因此,所提出的方法可成为在大规模场景下估计 Q矩阵的有用工具。

英文摘要:

Diagnostic classification models (DCMs) offer statistical tools to inspect the fined-grained attribute of respondents' strengths and weaknesses. However, the diagnosis accuracy deteriorates when misspecification occurs in the predefined item-attribute relationship, which is encoded into a Q-matrix. To prevent such misspecification, methodologists have recently developed several Bayesian Q-matrix estimation methods for greater estimation flexibility. However, these methods become infeasible in the case of large-scale assessments with a large number of attributes and items. In this study, we focused on the deterministic inputs, noisy "and" gate (DINA) model and proposed a new framework for the Q-matrix estimation to find the Q-matrix with the maximum marginal likelihood. Based on this framework, we developed a scalable estimation algorithm for the DINA Q-matrix by constructing an iteration algorithm that utilizes stochastic optimization and variational inference. The simulation and empirical studies reveal that the proposed method achieves high-speed computation, good accuracy, and robustness to potential misspecifications, such as initial value's choices and hyperparameter settings. Thus, the proposed method can be a useful tool for estimating a Q-matrix in large-scale settings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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