Skaggs Gary, Wolfe Edward W
Educational Leadership and Policy Studies, School of Education, Virginia Tech, 319 East Eggelston, Blacksburg, VA 24061, USA.
J Appl Meas. 2010;11(2):182-95.
The development of alternate forms of tests requires a statistical score adjustment called equating that permits the interchanging of scores from different test forms. Equating makes possible several important measurement applications, including removing practice effects in pretest-posttest research designs, improving test security, comparing scores between new and old forms, and supporting item bank development for computerized adaptive testing. This article summarizes equating methods from a Rasch measurement perspective. The four sections of this article present an introduction and definition of equating and related linking methods, data collection designs, equating procedures, and evaluating equated measures. The methods are illustrated with worked examples.
开发替代形式的测试需要一种称为等值的统计分数调整方法，该方法允许互换来自不同测试形式的分数。等值使几种重要的测量应用成为可能，包括消除前测-后测研究设计中的练习效应、提高测试安全性、比较新旧形式之间的分数，以及支持计算机自适应测试的题库开发。本文从拉施测量的角度总结了等值方法。本文的四个部分介绍并定义了等值及相关的链接方法、数据收集设计、等值程序，以及对等值测量进行评估。文中通过实例对这些方法进行了说明。
