Applied Psychometric Society
   Resource for professionals in psychometrics. Operated by Fordham University.
   http://www.fordham.edu/aps/

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
   http://www.testpublishers.org/journal01.htm

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.
   http://www.biophysics.mcw.edu/BRI-people/Rowe/BFA.html

Factor Analysis
   Introduction to factor analysis, with worked examples.
   http://www.psych.cornell.edu/Darlington/factor.htm

Ingrid Yahoo Group
   Free downloadable software for analysing repertory grids.
   http://groups.yahoo.com/group/ingrid/

Institute for Objective Measurement
   Rasch Scaling information from MESA at the University of Chicago. Includes full text articles.
   http://www.rasch.org/

Item Response Theory
   This website by Lawrence Rudner introduces Item Response Theory, and includes a complete on-line book.
   http://edres.org/irt/

L-BFGS-B Nonlinear Optimization Code
   Bounded optimisation code (FORTRAN) for numerical analysis, from Northwestern University.
   http://www.ece.northwestern.edu/~nocedal/lbfgsb.html

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.
   http://www.wright.edu/~robert.ping/research1.htm

Maydeu-Olivares, Albert
   Albert Maydeu-Olivares' homepage at the University of Barcelona: includes some unpublished working papers.
   http://www.ub.es/personal/amaydeu/amaydeuen.html

Multidimensional Scaling
   Searchable bibliography and selection of recent papers, from the University of Newcastle.
   http://www.ncl.ac.uk/mds/

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 ana
   http://www.psych.yorku.ca/lab/psy6140/

Mx
   Matrix algebra interpreter and numerical optimizer for structural equation modeling and other types of statistical modeling of data. Includes documentation and example code.
   http://www.vcu.edu/mx/

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.
   http://userpage.fu-berlin.de/~satow/psysoft.htm

Principal Components and Factor Analysis
   Chapter from StatSoft's Electronic Statistics Textbook.
   http://www.statsoft.com/textbook/stfacan.html

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.
   http://www.testpublishers.org/journal02.htm

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.
   http://www.uv.es/psicometria

Psychometrika
   Print journal of the Psychometric Society. Subscription and submission information and author instructions.
   http://www.psychometrika.org/

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.
   http://www.repgrid.com/

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.
   http://www.ssicentral.com/

Structural Equation Modeling FAQ
   Frequently asked questions for the SEMNET structural equation modeling discussion group.
   http://www.gsu.edu/~mkteer/semfaq.html

The Correlation Coefficient
   Online textbook by political scientist RJ Rummel.
   http://www.mega.nu:8080/ampp/rummel/uc.htm

The Reliability of Measuring Instruments
   Tom Knapp's book on reliability of measurement is freely available on this website.
   http://www.educ.ubc.ca/faculty/zumbo/series/knapp/index.htm

Understanding Factor Analysis
   Online textbook providing overview of factor analysis, by political scientist RJ Rummel.
   http://www.hawaii.edu/powerkills/UFA.HTM

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.
   http://www.winsteps.com/

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.
   http://forrest.psych.unc.edu/