Reliability and expected loss: A unifying principle

We provide a unified, theoretical basis on which measures of data reliability may be derived or evaluated, for both quantitative and qualitative data. This approach evaluates reliability as the proportional reduction in loss (PRL) that is attained in a sample by an optimal estimator. The resulting measure is between 0 and 1, linearly related to expected loss, and provides a direct way of contrasting the measured reliability in the sample with the least reliable and most reliable data-generating cases. The PRL measure is a generalization of many of the commonly-used reliability measures.We show how the quantitative measures from generalizability theory can be derived as PRL measures (including Cronbach's alpha and measures proposed by Winer). For categorical data, we develop a new measure for the general case in which each of N judges assigns a subject to one of K categories and show that it is equivalent to a measure proposed by Perreault and Leigh for the case where N is 2.Bruce Cooil is an Associate Professor of Statistics, and Roland T. Rust is a Professor and area head for Marketing. The authors thank three anonymous reviewers and an Associate Editor for their helpful comments and suggestions. This work was supported in part by the Dean's Fund for Faculty Research of the Owen Graduate School of Management, Vanderbilt University.     

More “tricks of the trade”: Reparameterizing LISREL models using negative variances

This paper shows how LISREL may be used to estimate simplex models which impose constraints on the variances of endogenous variables. This technique allows us to estimate both the parameters and the standard errors of the correlated measurement error model proposed by Wiley and Wiley (1974).We would like to thank Jim Wiley for his many helpful comments and suggestions on an earlier draft. We are grateful also to an anonymous reviewer for supplying the EQS program presented in Figure 4.     

MMCPC在中学生中的应用

为了解 MMCPC在中国中学生中是否适用 ,本研究选取了浙江省1 870名中学生进行测试 ,检验 MMCPC的信度和效度。结果显示 ,MMCPC在中国中学生群体中有较好的信度和一定效度。     

Stability of the Millon Clinical Multiaxial Inventory among psychiatric inpatients

This study investigated the stability of the Millon Clinical Multiaxial Inventory (MCMI) in a sample of psychiatric inpatients over a longer time period and from different perspectives than previous reliability studies. Test-retest reliability was assessed from three perspectives: correlation/regression, equivalence of dimensional structures across testings upon different admissions, and stability of personality style across testings. Some stability from a correlational perspective was found, with higher stability estimates indicated for the basic personality scales in comparison with the clinical symptom scales which is consistent with Millon's theory. The internal structure of the MCMI was essentially identical across testings. Although source of reinforcement and instrumental or coping style were stable across testings beyond chance, the MCMI profiles of a considerable number of subjects were inconsistent across testings. Correspondingly, clinicians should be cautious in using the MCMI to make categorical decisions regarding personality style with inpatients who are tested at admission and who have had repeated hospitalizations.     

项目反应理论在编制现代性量表中的应用

项目反应理论（ＩＲＴ）是近年来探讨较多的一种心理测量理论。由于其所具有的一些优于经典测验理论（ＣＴＴ）的特性,正得到愈来愈多的重视和应用。该研究旨在应用ＩＲＴ来编制现代性量表。人的现代化是整个社会现代化过程中不可缺少的部分,因此编制衡量人的现代性的量表有一定的理论和实践意义。研究结果表明,应用ＩＲＴ编制量表,在满足假设的情况下,可使量表既简便,又有较高的精度,效度研究表明本研究编制的现代性量表有较高的效度。     

Tests for equality of several alpha coefficients when their sample estimates are dependent

In a variety of measurement situations, the researcher may wish to compare the reliabilities of several instruments administered to the same sample of subjects. This paper presents eleven statistical procedures which test the equality ofm coefficient alphas when the sample alpha coefficients are dependent. Several of the procedures are derived in detail, and numerical examples are given for two. Since all of the procedures depend on approximate asymptotic results, Monte Carlo methods are used to assess the accuracy of the procedures for sample sizes of 50, 100, and 200. Both control of Type I error and power are evaluated by computer simulation. Two of the procedures are unable to control Type I errors satisfactorily. The remaining nine procedures perform properly, but three are somewhat superior in power and Type I error control.A more detailed version of this paper is also available.     

Effets du bilinguisme précoce sur la flexibilité représentationnelle et procédurale dans le dessin du bonhomme

The present research aims to evaluate representational and procedural flexibility by comparing the performances of simultaneous bilingual children French-Arabic (n = 28), successive bilingual children Tamil-French (n = 21) and French monolinguals (n = 24) at 5 years old and at 8 years old educated, in public school, in a disadvantaged neighborhood. The paradigm of the man that does not exist (Karmiloff-Smith, 1990) has been proposed to measure the ability to introduce graphic innovation into a familiar production and drawing a man by starting with the foot (Baldy, 2010) was used to evaluate the ability to make an usual pattern in an unusual way. The results show that bilingual children as young as 5 years old produce significantly more inter-categorical innovations than their monolingual peers while in monolingual children this capacity doesn’t appear until 8 years old. In procedural representations, the results are more nuanced. The underlying mechanisms that explain the best performance of bilingual children are discussed.