Psychometrics

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 and 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

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

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/

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.
http://ourworld.compuserve.com/homepages/jsuebersax/

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

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

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Albert Maydeu-Olivares' homepage at the University of Barcelona: includes some unpublished working papers.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

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

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

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/