Wolfe E W
459 Erickson Hall, Michigan State University, East Lansing, MI 48824, USA.
J Appl Meas. 2000;1(4):409-34.
This article describes Rasch measurement procedures for equating multiple test forms or calibrating an item bank. The procedures entail (a) selecting an appropriate data collection design, (b) estimating parameters, (c) transforming the parameters from multiple forms to a common scale, and (d) evaluating the quality of the linkage between these forms. Data collection designs include (a) anchor tests, (b) single group, (c) single data set, and (d) equivalent groups. Estimation procedures may involve (a) separate or (b) simultaneous calibration of data from multiple forms. Transformation is typically accomplished using (a) estimation scaling, but may involve (b) parameter anchoring or (c) computing equating constants. Link quality is evaluated using four fit indices: (a) item-within-link, (b) item-between-link, (c) link-within-bank, and (d) form-within-bank. These procedures are illustrated using an anchor test design.
本文介绍了用于对多个测试形式进行等值或校准题库的拉施测量程序。这些程序包括：(a)选择合适的数据收集设计，(b)估计参数，(c)将多个形式的参数转换到一个共同的量表上，以及(d)评估这些形式之间联系的质量。数据收集设计包括：(a)锚定测试，(b)单组，(c)单个数据集，以及(d)等效组。估计程序可能涉及：(a)对多个形式的数据进行单独校准或(b)同时校准。转换通常使用(a)估计量表来完成，但可能涉及(b)参数锚定或(c)计算等值常数。联系质量使用四个拟合指标来评估：(a)联系内的项目，(b)联系间的项目，(c)题库内联系，以及(d)题库内形式。使用锚定测试设计对这些程序进行了说明。
