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| 铆题比例对等值精度的影响 | |
| 引用本文： | 蔡艳,丁树良,涂冬波.铆题比例对等值精度的影响[J].心理学探新,2009,29(2):86-89. |
| 作者姓名： | 蔡艳 丁树良 涂冬波 |
| 作者单位： | 1. 江西师范大学,数学与信息科学学院,南昌,330027 2. 江西师范大学,计算机工程学院,南昌,330027 3. 江西师范大学,心理学院,南昌,330027 |
| 基金项目： | 国家自然科学基金研究项目，教育部高等院校博士基金研究项目，卫生部课题，江西省自然科学基金研究项目 |
| 摘 要： | 在非等组铆测验设计中，铆题量占测验长度的多大比例比较合适，这个比例随测验长度的增大可否发生变化？这些是实际工作者和研究者非常关心的问题。该文在固定被试数和测验长度的条件下，探查铆题量所占测验长度比例（简称铆题比例）的变化对等值精度的影响，讨论了在实际等值中如何在等值精度和铆题比例之间取得平衡的问题。并在模拟研究的条件下，给出了几个反应实际等值精度的指标。 |
| 关 键 词： | 铆题比 等值系数 参数估计 指标 |
The Effect of the Ratio of Anchor Items to Total Test on The Precision of Equating |
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| Cai Yan,Ding Shuliang,Tu Dongbo.The Effect of the Ratio of Anchor Items to Total Test on The Precision of Equating[J].Exploration of Psychology,2009,29(2):86-89. | |
| Authors: | Cai Yan Ding Shuliang Tu Dongbo |
| Institution: | Cai Yan, Ding Shuliang, Tu Dongbo( 1. Mathematic and information science department, Jiangxi Normal University, Nanchang 330027; 2. Computer information engineering department, Jiangxi Normal University, Nanchang 330027; 3. Psychology School, Jiangxi Normal University, Nanchang 330027) |
| Abstract: | To nonequivalent common- item test equating design,there are two important questions： When equating, which ratio is the most suitable？ When the test length is changed,must the ratio be maintained？ These problem are discussed under IRT.With the number of examinees fixed,this paper discussed two problem：the effect on the equating precision of the varying of the ratio of anchor items;how to trade off between the ratio of anchor items and the precision of equating. In this paper, some new indexes which reflect realistic rescaling precision are proposed under the simulation condition. |
| Keywords: | the ratio of anchor items to the test items equating coefficients parameter estimation indexes |
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