Item Response Theory
This website by Lawrence Rudner introduces Item Response Theory, and includes a complete on-line book.
Psychometric Software
Mountain Shadows Phonemic Awareness Scale (MS-PAS) and selection of Macintosh and Windows statistical analysis software, including parallel analysis.
Young, Forrest W.
Emiritus Professor of Quantitative Psychology at the University of North Carolina, Chapel Hill. Includes links to the VISta data visualization software, and plenty of resources for ALSCAL multidimensional scaling, including FORTRAN source code.
Ingrid Yahoo Group
Free downloadable software for analysing repertory grids.
Jefferson Psychometric Lab
University of Virginia based research group headed by Professor John J. McArdle. Includes COSAN, NOHARM, and LVLPS software for free download.
Latent Class Analysis and Latent Class Models
John Uebersax's resource for researchers interested in Latent Class Analysis (LCA) and Latent Class Models. Includes factor analysis of binary data.
Reliability and Validity
Clear introduction to the nature and assessment of test reliability and validity.
PMetric Psychometric Software System
Shareware for designing, applying, developing, and evaulating psychometric scales. The software features a scale editor, reliability analysis, central results database and other features.
Mx
Matrix algebra interpreter and numerical optimizer for structural equation modeling and other types of statistical modeling of data. Includes documentation and example code.
Bayesian Factor Analysis
Describes the Bayesian approach to factor analysis, which incorporates prior information and eliminates the need for rotation. Includes some full-text articles.
L-BFGS-B Nonlinear Optimization Code
Bounded optimisation code (FORTRAN) for numerical analysis, from Northwestern University.
The Reliability of Measuring Instruments
Tom Knapp's book on reliability of measurement is freely available on this website.
Applied Psychometric Society
Resource for professionals in psychometrics. Operated by Fordham University.
Structural Equation Modeling FAQ
Frequently asked questions for the SEMNET structural equation modeling discussion group.
Understanding Factor Analysis
Online textbook providing overview of factor analysis, by political scientist RJ Rummel.
The Correlation Coefficient
Online textbook by political scientist RJ Rummel.
Multidimensional Scaling
Searchable bibliography and selection of recent papers, from the University of Newcastle.
Paul Barrett
Free software for (advanced) psychometric analyses. Also a number of presentations on psychometrics.
Personal Construct Psychology Research Group
University of Wollongong based research group. Resources include free software for analysing repertory grids, and searchable citation database of PCP references.
Factor Analysis
Introduction to factor analysis, with worked examples.
Multivariate Data Analysis
Outline for Michael Friendly's course on multivariate data analysis and linear statistical models in behavioural science research. Includes bibliographies, computing guides, notes, and SAS examples covering topics such as regression, ANOVA, and factor analysis.
Psychometrika
Print journal of the Psychometric Society. Subscription and submission information and author instructions.
Institute for Objective Measurement
Rasch Scaling information from MESA at the University of Chicago. Includes full text articles.
RepGrid
Includes the Centre for Person-Computer Studies, Knowledge Support Systems, RepGrid and WebGrid software details, and the Personal Construct Psychology site. Many full-text articles for download.
Scientific Software International
Statistical software for the social sciences. Includes LISREL for structural equation modeling, HLM for hierarchical data analysis, and BILOG, BILOG-MG, MULTILOG, PARSCALE, and TESTFACT for IRT-based test analysis.
Principal Components and Factor Analysis
Chapter from StatSoft's Electronic Statistics Textbook.
Article: Increasing the Validity of Adapted Tests
Hambleton & Patsula (1999) article providing guidelines for adapting tests for cross-cultural and international uses--includes the ITC's Test Adaptation Guidelines
Promoting Stakeholder Acceptance of Computer-Based Testing
Jones (2000) article on communicating the value of and addressing issues regarding the implementation of computer-based testing.
Maydeu-Olivares, Albert
Albert Maydeu-Olivares' homepage at the University of Barcelona: includes some unpublished working papers.
Psychometrics Research Unit
Research results, questionnaires and publications of the Psychometrics Research Unit (University of Valencia, Spain). Content a mixture of English, Spanish, Valencian and Portuguese.
Winsteps and Facets Rasch Analysis Software
Software to construct linear measures from ordered qualitative observations. Includes details of training workshops; free student version and manual available for download.
Latent Variable Interactions and Quadratics
Resources focused on latent variable interactions and quadratics. Includes a bibliography, FAQ, Excel templates, full text articles, and full text monograph.
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