利用广义阶层线性模型研究具有DIF铆题时的测验等值,在进行等值时能有效地控制DIF效应,并与传统方法——有DIF铆题但等值时忽视DIF的存在下等值进行比较,从DIF效应值大小、铆题中DIF项目数和被试数等3个因素来考察两种方法对参数的估计或等值精度的影响.模拟研究发现采用广义阶层线性模型较传统方法参数估计或等值精度要高,除了DIF项目数和DIF效应值外,被试数也是影响参数估计精度的一重要因素.
Utilizing a hierarchical generalized linear model,which controls for DIF effects in test equating in the presence of DIF common-items,to investigate the effect on estimates from 3 factors:DIF magnitude,the number of DIF items,the number of examinee.The estimates were compared with the traditional method,i.e,ignoring DIF during equating.The results indicated that HGLM preformed better than the traditional method and examinee number is a important factor depart from the other two.