摘要
病态矩阵是IRT理论中项目参数估计必然面对的问题 本文以 2PLM参数估计为例 ,推导出参数估计迭代公式 ,系统阐述了三种病态控制方法的原理及在编程中数据处理的技巧 .
Ill-conditioned matrix is the important problem to face at Item Parameter Estimation in IRT theory. The iterative equation in 2PLM is derived. With some control method are also compared, and some techniques in programming is discussed.
出处
《宜春学院学报》
2004年第6期49-52,共4页
Journal of Yichun University
关键词
IRT理论
2plm项目参数估计
极大似然估计
病态矩阵
IRT theory
2PLM item parameter estimation
Maximum likelihood estimation
Ill-conditioned matrix
