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Maydeu-Olivares, Alberto; Brown, Gregory – Psychometrika, 2013

We offer an introduction to the five papers that make up this special section. These papers deal with a range of the methodological challenges that face researchers analyzing fMRI data--the spatial, multilevel, and longitudinal nature of the data, the sources of noise, and so on. The papers all provide analyses of data collected by a multi-site…

Descriptors: Data Analysis, Measurement, Brain, Diagnostic Tests

Vasdekis, Vassilis G. S.; Cagnone, Silvia; Moustaki, Irini – Psychometrika, 2012

The paper proposes a composite likelihood estimation approach that uses bivariate instead of multivariate marginal probabilities for ordinal longitudinal responses using a latent variable model. The model considers time-dependent latent variables and item-specific random effects to be accountable for the interdependencies of the multivariate…

Descriptors: Geometric Concepts, Computation, Probability, Longitudinal Studies

Jennrich, Robert I.; Bentler, Peter M. – Psychometrika, 2012

Bi-factor analysis is a form of confirmatory factor analysis originally introduced by Holzinger and Swineford ("Psychometrika" 47:41-54, 1937). The bi-factor model has a general factor, a number of group factors, and an explicit bi-factor structure. Jennrich and Bentler ("Psychometrika" 76:537-549, 2011) introduced an exploratory form of bi-factor…

Descriptors: Factor Structure, Factor Analysis, Models, Comparative Analysis

Peeters, Carel F. W. – Psychometrika, 2012

In an addendum to his seminal 1969 article Joreskog stated two sets of conditions for rotational identification of the oblique factor solution under utilization of fixed zero elements in the factor loadings matrix (Joreskog in "Advances in factor analysis and structural equation models," pp. 40-43, 1979). These condition sets, formulated under…

Descriptors: Structural Equation Models, Factor Analysis, Correlation

Warrens, Matthijs J. – Psychometrika, 2012

The quadratically weighted kappa is the most commonly used weighted kappa statistic for summarizing interrater agreement on an ordinal scale. The paper presents several properties of the quadratically weighted kappa that are paradoxical. For agreement tables with an odd number of categories "n" it is shown that if one of the raters uses the same…

Descriptors: Interrater Reliability, Statistics, Measurement

Gaer, Eva Vande; Ceulemans, Eva; Van Mechelen, Iven; Kuppens, Peter – Psychometrika, 2012

In many psychological research domains stimulus-response profiles are explained by conjecturing a sequential process in which some variables mediate between stimuli and responses. Charting sequential processes is often a complex task because (1) many possible mediating variables may exist, and (2) interindividual differences may occur in the…

Descriptors: Stimuli, Responses, Psychological Studies, Sequential Approach

Magis, David; Raiche, Gilles – Psychometrika, 2012

This paper focuses on two estimators of ability with logistic item response theory models: the Bayesian modal (BM) estimator and the weighted likelihood (WL) estimator. For the BM estimator, Jeffreys' prior distribution is considered, and the corresponding estimator is referred to as the Jeffreys modal (JM) estimator. It is established that under…

Descriptors: Item Response Theory, Computation, Bayesian Statistics, Models

Ranger, Jochen; Kuhn, Jorg-Tobias – Psychometrika, 2012

Latent trait models for response times in tests have become popular recently. One challenge for response time modeling is the fact that the distribution of response times can differ considerably even in similar tests. In order to reduce the need for tailor-made models, a model is proposed that unifies two popular approaches to response time…

Descriptors: Reaction Time, Tests, Models, Computation

Kim, Seonghoon – Psychometrika, 2012

Assuming item parameters on a test are known constants, the reliability coefficient for item response theory (IRT) ability estimates is defined for a population of examinees in two different ways: as (a) the product-moment correlation between ability estimates on two parallel forms of a test and (b) the squared correlation between the true…

Descriptors: Reliability, Item Response Theory, Tests, Correlation

Choulakian, Vartan – Psychometrika, 2011

The Maxbet method is a generalized principal components analysis of a data set, where the group structure of the variables is taken into account. Similarly, 3-block[12,13] partial Maxdiff method is a generalization of covariance analysis, where only the covariances between blocks (1, 2) and (1, 3) are taken into account. The aim of this paper is…

Descriptors: Factor Analysis, Statistical Analysis

Huang, Guan-Hua; Wang, Su-Mei; Hsu, Chung-Chu – Psychometrika, 2011

Statisticians typically estimate the parameters of latent class and latent profile models using the Expectation-Maximization algorithm. This paper proposes an alternative two-stage approach to model fitting. The first stage uses the modified k-means and hierarchical clustering algorithms to identify the latent classes that best satisfy the…

Descriptors: Mathematics, Data Analysis, Classification, Models

Brusco, Michael; Steinley, Douglas – Psychometrika, 2011

Two-mode binary data matrices arise in a variety of social network contexts, such as the attendance or non-attendance of individuals at events, the participation or lack of participation of groups in projects, and the votes of judges on cases. A popular method for analyzing such data is two-mode blockmodeling based on structural equivalence, where…

Descriptors: Heuristics, Matrices, Data Analysis, Computation

Davis-Stober, Clintin P. – Psychometrika, 2011

Many researchers have demonstrated that fixed, exogenously chosen weights can be useful alternatives to Ordinary Least Squares (OLS) estimation within the linear model (e.g., Dawes, Am. Psychol. 34:571-582, 1979; Einhorn & Hogarth, Org. Behav. Human Perform. 13:171-192, 1975; Wainer, Psychol. Bull. 83:213-217, 1976). Generalizing the approach of…

Descriptors: Least Squares Statistics, Error of Measurement, Geometry, Computation

Bocci, Laura; Vichi, Maurizio – Psychometrika, 2011

A weighted Euclidean distance model for analyzing three-way dissimilarity data (stimuli by stimuli by subjects) for heterogeneous subjects is proposed. First, it is shown that INDSCAL may fail to identify a common space representative of the observed data structure in presence of heterogeneity. A new model that removes the rotational invariance of…

Descriptors: Models, Data Analysis, Multidimensional Scaling

Loeys, T.; Rosseel, Y.; Baten, K. – Psychometrika, 2011

In the psycholinguistic literature, reaction times and accuracy can be analyzed separately using mixed (logistic) effects models with crossed random effects for item and subject. Given the potential correlation between these two outcomes, a joint model for the reaction time and accuracy may provide further insight. In this paper, a Bayesian…

Descriptors: Reaction Time, Psycholinguistics, Simulation, Word Recognition