Minimizing the number of observations: A generalization of the spearman-brown formula

A new method for determining the minimum number of observations per subject needed to achieve a specific generalizability coefficient is presented. This method, which consists of a branch-and-bound algorithm, allows for the employment of constraints specified by the investigator.     

Inferential procedures for multifaceted coefficients of generalizability

A two-facet measurement model with broad application in the behavioral sciences is identified, and its coefficient of generalizability (CG) is examined. A normalizing transformation is proposed, and an asymptotic variance expression is derived. Three other multifaceted measurement models and CGs are identified, and variance expressions are presented. Next, an empirical investigation of the procedures follows, and it is shown that, in most cases, Type I error control in inferential applications is precise, and that the estimates are relatively efficient compared with the correlation coefficient. Implications for further research and for practice are noted. In an Appendix, four additional models, CGs, and variance expressions are presented.The research reported herein formed part of a doctoral dissertation conducted by Marsha Schroeder (Schroeder, 1986), under the direction of Ralph Hakstian, at the University of British Columbia. We acknowledge with thanks the contributions to this research of Todd Rogers and James Steiger. We are also very indebted to an mous reviewer who provided some important clarifications in connection with two of the models considered. Some support for this research was provided by a grant to Ralph Hakstian from the Natural Sciences and Engineering Research Council of Canada.     

三种心理测量理论的信度观

目前,心理测量领域中主要存在三大理论派别。本文分别对这三种理论即经典测验理论、可概括性理论和项目反应理论作了简要介绍,着重分析这三种理论的信度观。文章讨论了这三种信度观的理论基础和研究方法,比较了它们的异同,指出经典测验理论存在的一些不足及概化理论和项目反应理论所作的改进。概化理论是对经典测验理论的扩展,它用多维的信度指标（概化系数）替代了经典测验理论的信度系数,项目反应理论则从信息量的角度出发,用项目信息函数、测验信息函数等指标更具体深入地反映项目、测验的测量可靠程度。     

Considerations in the choice of interobserver reliability estimates

Two types of interobserver reliability values may be needed in treatment studies in which observers constitute the primary data-acquisition system: trial reliability and the reliability of the composite unit or score which is subsequently analyzed, e.g., daily or weekly session totals. Two approaches to determining interobserver reliability are described: percentage agreement and "correlational" measures of reliability. The interpretation of these estimates, factors affecting their magnitude, and the advantages and limitations of each approach are presented.     

标准参照测验及其等级线信度的概化理论分析

在测量工作中,误用经典测验理论方法估计标准参照性测验的整体信度和等级线决策信度的情况非常突出。如,无论测量设计是交叉的还是嵌套的,也无论测验结果是做常模参照性解释,还是做标准参照性解释,测验工作者往往只报告克龙巴赫α系数或经典测验理论中的其它少数几个信度指标,而误把整体信度作为等级线信度的现象则更加普遍,这是十分不妥的。本文借用概化理论中的可靠性指数Φ和Φ(λ)公式,分别针对交叉设计和嵌套设计,就标准参照性测验的整体信度和等级分数线决策信度的估计问题进行了探讨。用数据演示的方法比较了交叉设计与嵌套设计在估计标准参照性测验整体信度方面的差异,展示了等级决策分数线决策信度的估计方法。     

高校教师教学水平评价概化理论预算限制下最佳样本量估计

使用“高校教师教学水平评价问卷”，要求566名学生对19名教师进行评价，对收集到的数据作不同的概化设计，包括t×i、（s：t）×i、（s：t）×（i：v）和（s：t）×（i：v）×o四种设计。基于概化理论，结合预算限制，统一LaGrange乘法公式，自行推导不同设计的最佳样本量公式，联合估计的方差分量，计算出不同设计的最佳样本量。结果表明：（1）LaGrange乘法统一公式表现出较强的通用性，能够适用于预算限制下各种概化设计；（2）评价场合是影响高校教师教学水平评价一个相当重要的因素；（3）（s：t）×（i：v）×o是高校教师教学水平评价概化理论预算限制下最优概化设计；（4）高校教师教学水平评价概化理论预算限制下，每位教师最佳评价学生人数为20人，每个维度最佳评价题目数为3题。     

The design of the MBT‐G adherence and quality scale

Few group psychotherapy studies focus on therapists' interventions, and instruments that can measure group psychotherapy treatment fidelity are scarce. The aim of the present study was to evaluate the reliability of the Mentalization‐based Group Therapy Adherence and Quality Scale (MBT‐G‐AQS), which is a 19‐item scale developed to measure adherence and quality in mentalization‐based group therapy (MBT‐G). Eight MBT groups and eight psychodynamic groups (a total of 16 videotaped therapy sessions) were rated independently by five raters. All groups were long‐term, outpatient psychotherapy groups with 1.5 hours weekly sessions. Data were analysed by a Generalizability Study (G‐study and D‐study). The generalizability models included analyses of reliability for different numbers of raters. The global (overall) ratings for adherence and quality showed high to excellent reliability for all numbers of raters (the reliability by use of five raters was 0.97 for adherence and 0.96 for quality). The mean reliability for all 19 items for a single rater was 0.57 (item range 0.26–0.86) for adherence, and 0.62 (item range 0.26–0.83) for quality. The reliability for two raters obtained mean absolute G‐coefficients on 0.71 (item range 0.41–0.92 for the different items) for adherence and 0.76 (item range 0.42–0.91) for quality. With all five raters the mean absolute G‐coefficient for adherence was 0.86 (item range 0.63–0.97) and 0.88 for quality (item range 0.64–0.96). The study demonstrates high reliability of ratings of MBT‐G‐AQS. In models differentiating between different numbers of raters, reliability was particularly high when including several raters, but was also acceptable for two raters. For practical purposes, the MBT‐G‐AQS can be used for training, supervision and psychotherapy research.     

表现性评价中评分者信度估计方法的比较研究--从相关法、百分比法到概化理论

随着素质教育的推进．表现性评价受到越来越多的重视。影响表现性评价结果信度的一个重要因素是评分者之间的不一致。文章使用模拟数据,在对比评分者一致性的相关法、一致性百分比法和概化系数等各种估计方法的基础上,提出概化理论在表现性评价中评分者信度问题上的应用是理论和实践发展的有益方向。     

心理学对和谐社会的贡献

心理学在现代社会中具有满足社会需求的任务。多数国家都有这种社会需求,使得心理学成为真正意义上的跨国界学科。心理学确实能够提供解决问题的一般方法,但在面对某个国家的具体国情时则需要特殊的处理方法。在不同体制国家里所做的研究并不一定完全适用于其他国家,这意味着对一个国家里提出的心理学问题,还必须在本国内做进一步的基础研究。每个国家都需要这种心理学的本土化过程。本文提供一些研究案例,其研究成果既是有意义的,但还需要进一步研究。如何为和谐社会做贡献,作者提出了一个研究框架