Department of Biostatistical Sciences, Wake Forest School of Medicine, Medical Center Blvd., WC23, Winston-Salem, NC, 27157, USA,
Qual Life Res. 2013 Oct;22(8):1907-15. doi: 10.1007/s11136-012-0346-9. Epub 2013 Jan 19.
This paper reports on the psychometric properties of a computerized adaptive test (CAT) version of the Mobility Assessment Tool (MAT) for older adults (MAT-CAT).
An item pool of 78 video-animation-based items for mobility was developed, and response data were collected from a sample of 234 participants aged 65-90 years. The video-animation-based instrument was designed to minimize ambiguity in the presentation of task demands. In addition to evaluating traditional psychometric properties including dimensionality, differential item functioning (DIF), and local dependence, we extensively tested the performance of several MAT-CAT measures and compared their performances with a fixed format.
Operationally, the MAT-CAT was sufficiently unidimensional and had acceptable levels of local independence. One DIF item was removed. Most importantly, the CAT measures showed that even starting with a single fixed item at the mean ability, the adaptive version delivered better performance than the fixed format in terms of several criteria including the standard error of estimate.
The MAT-CAT demonstrated satisfactory psychometric properties and superior performance to a fixed format. The video-animation-based adaptive instrument can be used for assessing mobility with specificity and precision.
本文报告了一种针对老年人的移动能力评估工具（MAT）的计算机自适应测试（CAT）版本（MAT-CAT）的心理测量学特性。
开发了一个包含 78 个基于视频动画的移动项目的项目库，并从 234 名年龄在 65-90 岁的参与者中收集了反应数据。基于视频动画的工具旨在最大限度地减少任务需求呈现的歧义。除了评估传统的心理测量学特性，包括维度、差异项目功能（DIF）和局部依赖性外，我们还广泛测试了几种 MAT-CAT 测量的性能，并将其与固定格式进行了比较。
从操作上看，MAT-CAT 具有足够的单维性和可接受的局部独立性。一个差异项目被删除。最重要的是，CAT 测量表明，即使从平均能力的单个固定项目开始，自适应版本在几个标准（包括估计的标准误差）方面的表现都优于固定格式。
MAT-CAT 表现出令人满意的心理测量学特性和优于固定格式的性能。基于视频动画的自适应工具可以特异性和精确性地用于评估移动能力。
