Institute for Objective Measurement, Inc.
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Welcome to the website of the IOM! We offer you information on a wide variety of measurement programs and services. Please click below on as many selections as you would like.
|Research Papers, Notes and Reports (full text)|
including "Measurement Essentials", "Popular Measurement"
|Rasch Measurement SIG (AERA): Rasch Measurement Transactions|
|Rasch Software: Freeware and Paid||Book Sales||Rasch-friendly Journals|
|Mission||<!a href="http://www.rasch.org/vision.htm">Vision (under review)||Definition of Measurement||Board of Directors|
|Publications||<! a href="http://www.rasch.org/dm/1-Proc.htm">Certification (undex review)||Conferences
|Speakers Bureau||Directory of Consultants||To Reach Us||Other Places To Look|
|New Rasch Measurement Book!!!|
We are pleased to share the publication of Rasch Measurement Theory Analysis in R. This book provides researchers and practitioners with a step-by-step guide for conducting Rasch measurement theory analyses using R. It includes theoretical introductions to major Rasch measurement principles and techniques, demonstrations of analyses using several R packages that contain Rasch measurement functions, and sample interpretations of results.
Key features of the book include:
This book applies Rasch measurement theory to the fields of education, psychology, sociology, marketing and health outcomes in order to measure various social constructs. The chief focus is on first principles of both the theory and its applications. Because software is readily available to carry out analyses of real data, numerous small examples are provided in the book. The software used in these examples, and which is helpful in working through the text, is RUMM2030 (Rasch unidimensional models for measurement).
The book's main goals are to equip researchers with the confidence they need in order to be in control of the analysis and interpretation of data, and to make professional rather than primarily statistical decisions mechanically. Because statistical principles are necessarily involved, reviews of the requisite statistics are provided in the Appendix.
The content is based on courses that have been taught both online and in intensive form for over two decades. Although first principles are emphasised, much of the book is based on research conducted by the two authors and their colleagues.
|Publisher PDF (181MB)||Publisher PDF (198MB)|
|Standard PDF (81MB)||Standard PDF (81MB)|
|Reduced PDF (26MB)||Reduced PDF (26MB)|
|Coming Rasch-related Events|
|June 23 - July 21, 2023, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com|
|Aug. 11 - Sept. 8, 2023, Fri.-Fri.||On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.com|