【摘要】 在多级评分模型下,项目的难度参数或步骤参数有多个,在对多级评分模型进行选题时,通常对项目的多个难度参数用一个综合的指标来概括。当对每个项目的难度参数进行有效的综合后,综合后的难度参数分布发生了改变,这时如果增加适量的平均难度较难或较易的项目进入题库,测验的精度和项目的曝光率都有一定的改善。更多还原

【Abstract】 In the multi-level scoring model,usually there are a few item difficulty parameters and step parameters. Generally,a comprehensive index is used to synthesize multiple item difficulty parameters when items are selected in the case. The distribution of the difficulty parameter varies obtained by summarizing each item’s effectively. The test accuracy and item exposure rate all get a certain improved after adding some items into the bank which are more difficult( or easier) than the average difficulty.更多还原