欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
在计算机化自适应测验（CAT）的研究中,制定既高效又安全的选题策略是一个追求目标。用极大项目信息量准则（MIC）选题使得测验效率高、能力估计准确,缺点是项目调用很不均匀,影响考试的安全;按a分层法通过控制试题曝光率以提高考试的安全性,但该方法可能会使测验效率略有下降,且该方法在各层内部无法实现对区分度的调整。本文针对上述两种选题策略的优缺点,对0-1评分下的CAT,通过引入曝光因子、分阶段自动调整区分度的影响以及提高选题准确性等手段,对MIC和a-STR进行改进,引入了两类新的选题策略。计算机模拟实验显示,新的选题方法效果比较理想。
英文摘要：
As far as Computerized Adaptive Testing （CAT） is concerned, the issue of item selection strategy has received more attention because of its vital role. It is well known that there are two typical selection strategies called Maximum Information Criterion （MIC） and a-Stratification （a-STR）. However, both of the two strategies have their advantages together with their downsides. On the one hand, MIC method can obtain high efficiency and accurate estimation of ability; on the other hand, its uneven item selection may lead to the insecurity of examination. Meanwhile, though a-STR can improve the test security by controlling the item exposure rate, it may result in the inefficiency of the test and failure in adjusting the discrimination within the layers. As a result, the development of both effective and safe item selection strategies has always been a goal to pursue in studies on CAT. According to the previous studies, the test security can be enhanced and the item pool utilization rate can be increased by balancing the item exposure rate. Therefore, in 0-1 scored CAT, two new item selection strategies are proposed in this paper to improve the MIC and a-STR methods by introducing exposure factor, adjusting automatically the discrimination by stage and increasing the accuracy of item selection. One of the new item selection strategies has three prominent characteristics： First, a function of item information （FII） rather than the item information function is set up to combine the advantages of both MIC and a-STR. Second, the effect of the discrimination on different stages in CAT is taken into account and a function of item discrimination is used in the FII to make up for the defect of a-STR for not being able to control the item discrimination in the internal layer. Third, mechanism of online control exposure is adopted. While some specific items in a certain examination process are more frequently exposured than others, with the help of the mechanism, they will turn out to become less likely to be
同期刊论文项目
同项目期刊论文
位置：