Science

Albert Maydeu-Olivares' homepage at the University of Barcelona: includes some unpublished working papers.

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

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.

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

Rasch Scaling information from MESA at the University of Chicago. Includes full text articles.

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

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

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.

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

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

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

This website by Lawrence Rudner introduces Item Response Theory, and includes a complete on-line book.

Bounded optimisation code (FORTRAN) for numerical analysis, from Northwestern University.

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

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

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

Offers online practice psychometric tests and courses developed by experienced psychologists.

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

John Uebersax's resource for researchers interested in latent class analysis and latent class models.

Offers clinical assessment courses, counseling, training and the Wartegg testing methodology.