"Science does not, so far as we know, produce theories which are true or even highly
probable. Although rare, it sometimes happens that a theory exactly predicts an
experimental outcome. When that desirable result is achieved, there is cause for
general rejoicing. It is far more common for the predictions deduced from a theory
to come close to reproducing the data which constitute a specific problem, but with
no exact coincidence of results. ... Empirical problems are frequently solved because,
for problem solving purposes, we do not require an exact, but only an approximate,
resemblance between theoretical results and experimental ones."
Larry Laudan, Progress and its Problems. Berkeley, CA: University of California Press, 1977, pp. 23, 224
"Essentially, all models are wrong, but some are useful."
Box, G. E. P., and Draper, N. R., (1987), Empirical Model Building and Response Surfaces, John Wiley & Sons, New York, NY.
"Measurement appears to require that three conditions be met. The first of these conditions is that one have a working concept of the character to be measured. A psychologist needs a clear notion of what intelligence is before he constructs a test to measure it. Binet, for example, struggled for some years to get an idea of the character he ought to be trying to measure. The crystallization of a clear concept of what one desires to measure is often a critical point in the development of a field of research. In early work, the concept must almost necessarily be vague and nebulous, representing a sort of groping for something that will satisfy a certain purpose. The measurements resulting from such a concept naturally contain an abundance of spurious elements. The cultivation and delimitation of a valid concept of a critical variable is in itself an important contribution to measurement.
"The second necessary condition of measurement is a satisfactory representation of the character to be measured, in the amount that is exhibited by the phenomenon [e.g., student ability]. By a satisfactory representation, we mean one that is perceptible, accurate, and convenient. In some cases, this is equivalent to saying that, for characteristics which are not directly perceptible, an objectifying function or agent [e.g., a test item] must be found.
"This brings us to our third condition for measurement, which is a basis for quantitative comparison. Measurement is essentially a "more-than" or "less- than" type of comparison between a reference point (usually a mark on a scale) and the phenomenon. Measurement in terms of units which are equal, fixed, and standardized, is of course ordinarily to be preferred where it is possible. In the first place, such measurements can be readily recorded and transmitted to others. In the second place, they ordinarily convey more significance to a larger number of people than do unequal units, or values having special significance because of certain unique experiences connected with them. In the third place, they facilitate - in fact they make possible - quantitative science, with its many interrelations, expressed as laws and functions. To utilize units which do not correspond to our number system (in the sense of equal increments) would be to inject hopeless confusion into problems that are at best baffling."
Douglas E. Scates, excerpted from Psychometrika, March 1937, Vol. 2, No.1, p. 27-34.
"G. Rasch's Probabilistic Models.. book represents an attempt to
create new paths for scientific behavioral statistics which, till now, have confused
groups with individuals... We encourage as many people as possible to obtain and
read the book."
from a 1962 review by Sven Rydberg, University of Stockholm, Nordisk Psykologi, 14(7), p.347-8.
RMT 7:3 Quotations and Notations. Rasch Measurement Transactions, 1993, 7:3 p.312ff.
|Rasch Measurement Transactions (free, online)||Rasch Measurement research papers (free, online)||Probabilistic Models for Some Intelligence and Attainment Tests, Georg Rasch||Applying the Rasch Model 3rd. Ed., Bond & Fox||Best Test Design, Wright & Stone|
|Rating Scale Analysis, Wright & Masters||Introduction to Rasch Measurement, E. Smith & R. Smith||Introduction to Many-Facet Rasch Measurement, Thomas Eckes||Invariant Measurement: Using Rasch Models in the Social, Behavioral, and Health Sciences, George Engelhard, Jr.||Statistical Analyses for Language Testers, Rita Green|
|Rasch Models: Foundations, Recent Developments, and Applications, Fischer & Molenaar||Journal of Applied Measurement||Rasch models for measurement, David Andrich||Constructing Measures, Mark Wilson||Rasch Analysis in the Human Sciences, Boone, Stave, Yale|
|in Spanish:||Análisis de Rasch para todos, Agustín Tristán||Mediciones, Posicionamientos y Diagnósticos Competitivos, Juan Ramón Oreja Rodríguez|
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|Coming Rasch-related Events|
|March 21, 2019, Thur.||13th annual meeting of the UK Rasch user group, Cambridge, UK, http://www.cambridgeassessment.org.uk/events/uk-rasch-user-group-2019|
|April 4 - 8, 2019, Thur.-Mon.||NCME annual meeting, Toronto, Canada,https://ncme.connectedcommunity.org/meetings/annual|
|April 5 - 9, 2019, Fri.-Tue.||AERA annual meeting, Toronto, Canada,www.aera.net/Events-Meetings/Annual-Meeting|
|April 12, 2019, Fri.||On-line course: Understanding Rasch Measurement Theory - Master's Level (G. Masters), https://www.acer.org/au/professional-learning/postgraduate/rasch|
|May 24 - June 21, 2019, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|May 22 - 30, 2019, Wed.-Thu.||Measuring and scale construction (with the Rasch Model), University of Manchester, England, https://www.cmist.manchester.ac.uk/study/short/intermediate/measurement-with-the-rasch-model/|
|June 4 - 7, 2019, Tue.-Fri.||In-Person Italian Rasch Analysis Workshop based on RUMM (Fabio La Porta and Serena Caselli; entirely in Italian). Prof David Andrich from Western Australia University will be hosted by the workshop. For enquiries and registration email to firstname.lastname@example.org|
|June 17-19, 2019, Mon.-Wed.||In-person workshop, Melbourne, Australia: Applying the Rasch Model in the Human Sciences: Introduction to Rasch measurement (Trevor Bond, Winsteps), Announcement|
|June 20-21, 2019, Thurs.-Fri.||In-person workshop, Melbourne, Australia: Applying the Rasch Model in the Human Sciences: Advanced Rasch measurement with Facets (Trevor Bond, Facets), Announcement|
|June 28 - July 26, 2019, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com|
|July 2-5, 2019, Tue.-Fri.||2019 International Measurement Confederation (IMEKO) Joint Symposium, St. Petersburg, Russia,https://imeko19-spb.org|
|July 11-12 & 15-19, 2019, Thu.-Fri.||A Course in Rasch Measurement Theory (D.Andrich), University of Western Australia, Perth, Australia, flyer - http://www.education.uwa.edu.au/ppl/courses|
|Aug 5 - 10, 2019, Mon.-Sat.||6th International Summer School "Applied Psychometrics in Psychology and Education", Institute of Education at HSE University Moscow, Russia.https://ioe.hse.ru/en/announcements/248134963.html|
|Aug. 9 - Sept. 6, 2019, Fri.-Fri.||On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.com|
|August 25-30, 2019, Sun.-Fri.||Pacific Rim Objective Measurement Society (PROMS) 2019, Surabaya, Indonesia https://proms.promsociety.org/2019/|
|Oct. 11 - Nov. 8, 2019, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|Nov. 3 - Nov. 4, 2019, Sun.-Mon.||International Outcome Measurement Conference, Chicago, IL,http://jampress.org/iomc2019.htm|
|Jan. 24 - Feb. 21, 2020, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|May 22 - June 19, 2020, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|June 26 - July 24, 2020, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com|
|Aug. 7 - Sept. 4, 2020, Fri.-Fri.||On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.com|
|Oct. 9 - Nov. 6, 2020, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|June 25 - July 23, 2021, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com|
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