Pae Hye, Greenberg Daphne, Morris Robin D
University of Cincinnati.
Lang Assess Q. 2012;9(2):152-171. doi: 10.1080/15434303.2011.613504. Epub 2012 May 7.
The aim of this study was to apply the Rasch model to an analysis of the psychometric properties of the PPVT-III Form A items with struggling adult readers. METHODS: The PPVT-IIIA was administered to 229 African-American adults whose isolated word reading skills were between third and fifth grades. Conformity of the adults' performance on the PPVT-III items was evaluated using the Winsteps software. RESULTS: Analysis of all PPVT-IIIA items combined did not fully support its use as a useful measure of receptive vocabulary for struggling adult readers who were African Americans. To achieve an adequate model fit, items 73 through item 156 were analyzed. The items analyzed showed adequate internal consistency reliability, unidimensionality, and freedom from differential item functioning for ability, gender, and age, with a minor modification. DISCUSSION: With an appropriate treatment of misfit items, the results supported the measurement properties, internal consistency reliability, unidimensionality of the PPVT-IIIA items, and measurement invariance of the test across subgroups of ability, age, and gender.
本研究的目的是将拉施模型应用于对有阅读困难的成年读者的皮博迪图片词汇测验第三版A式项目的心理测量特性进行分析。方法：对229名非裔美国成年人施测皮博迪图片词汇测验第三版A式，这些成年人的孤立单词阅读技能处于三年级到五年级水平。使用Winsteps软件评估成年人在皮博迪图片词汇测验第三版项目上的表现的一致性。结果：对所有皮博迪图片词汇测验第三版A式项目进行综合分析，并不完全支持将其作为评估有阅读困难的成年非裔美国读者接受性词汇的有效测量工具。为了获得足够的模型拟合度，对第73项至第156项进行了分析。经分析的项目显示出足够的内部一致性信度、单维性，并且在能力、性别和年龄方面不存在项目功能差异，但需进行微小修改。讨论：通过对不拟合项目进行适当处理，结果支持了皮博迪图片词汇测验第三版A式项目的测量特性、内部一致性、单维性以及该测验在能力、年龄和性别亚组间的测量不变性。
