在EXCEL中应用Rasch模型计算题目难度

Rasch Model Applied to Item Difficulty Calculation in EXCEL

应用Rasch模型计算出来的题目难度值与被试样本无关,是题目的一项最重要的量化指标。Rasch模型的题目难度的计算在EXCEL程序中能很方便地完成,本文介绍了详细的计算步骤,并讨论了怎样用题目难度值来估算考生的能力水平。

Item difficulty value calculated by Rasch Model is independent of the average ability of any examinee sample.The most important characteristic of an item to be determined is its difficulty in a quanti-tative sense.The calculation can be facilitated using the EXCEL Program.The five calculation steps are il-lustrated in this article.The way to match item difficulty value with examinee's ability is also discussed.