Web Directory

» Ability Tests and Psychometric Assessments
   Provides information, resources, and sample ability tests and personality questionnaires. Includes tips on taking tests and how to prepare for them.
   http://testingcentre.nicheconsulting.co.nz

» 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

» 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/

» Institute of Psychometric Coaching
   Offers online practice psychometric tests and courses developed by experienced psychologists.
   http://www.psychometricinstitute.com.au

» Italian Institute of Wartegg
   Offers clinical assessment courses, counseling, training and the Wartegg testing methodology.
   http://www.wartegg.com

» 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 Structure Analysis
   John Uebersax's resource for researchers interested in latent class analysis and latent class models.
   http://john-uebersax.com/stat/

» 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 evaluating psychometric scales. The software features a scale editor, reliability analysis, central results database and other features.
   http://userpage.fu-berlin.de/~satow/psysoft.htm

» PeopleTester.com
   Offers online psychometric tests in any language for recruitment, selection and development. Includes a free sample test, case studies and a brochure.
   http://PeopleTester.com

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

» Psych Press
   Developer of online and psychology-based psychometric test materials designed to screen and match individuals to particular roles, industries and companies.
   http://www.psychpress.com.au

» 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/

» Reliability and Validity
   Clear introduction to the nature and assessment of test reliability and validity.
   http://www.socialresearchmethods.net/kb/relandval.php

» 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

» Tamabilt Software Solutions
   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.
   http://tamabilt.com/index.html

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

» The Psychometrics Forum
   Independent group of UK psychometric practitioners. Includes information on the benefits of membership, how to join, news, events and FAQ.
   http://www.psychometricsforum.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

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

» University of Cambridge: The Psychometrics Centre
   Undertakes research into the theory and practice of psychological, educational and clinical measurement.
   http://www.psychometrics.sps.cam.ac.uk

» 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/