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.

Software to construct linear measures from ordered qualitative observations. Includes details of training workshops; free student version and manual available for download.

Online textbook providing overview of factor analysis, by political scientist RJ Rummel.

Offers Tom Knapp's book on reliability of measurement.

Independent group of UK psychometric practitioners. Includes information on the benefits of membership, how to join, news, events and FAQ.

Online textbook by political scientist RJ Rummel.

Offers psychometric and statistical consulting services, data analysis and custom software development. Also provides instructional material for psychometric methodologies and software applications available for purchase.

Frequently asked questions for the SEMNET structural equation modeling discussion group.

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.

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.

Clear introduction to the nature and assessment of test reliability and validity.

Print journal of the Psychometric Society. Subscription and submission information and author instructions.

Research results, questionnaires and publications of the Psychometrics Research Unit (University of Valencia, Spain). Content a mixture of English, Spanish, Valencian and Portuguese.

Developer of online and psychology-based psychometric test materials designed to screen and match individuals to particular roles, industries and companies.

Chapter from StatSoft's Electronic Statistics Textbook.

Shareware for designing, applying, developing, and evaluating psychometric scales. The software features a scale editor, reliability analysis, central results database and other features.

Offers online psychometric tests in any language for recruitment, selection and development. Includes a free sample test, case studies and a brochure.

Free software for (advanced) psychometric analyses. Also a number of presentations on psychometrics.

Matrix algebra interpreter and numerical optimizer for structural equation modeling and other types of statistical modeling of data. Includes documentation and example code.

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.

Searchable bibliography and selection of recent papers, from the University of Newcastle.

Albert Maydeu-Olivares' homepage at the University of Barcelona: includes some unpublished working papers.

Resources focused on latent variable interactions and quadratics. Includes a bibliography, FAQ, Excel templates, full text articles, and full text monograph.