"[Astronomer Johannes] Kepler's thought is, that of a number of variant hypotheses about the same facts, that one is true which shows why facts, which in the other hypotheses remain unrelated, are as they are, i.e., which demonstrates their orderly and rational mathematical connexion. To put it in his own summary: `Therefore, neither this nor that supposition is worthy of the name of an astronomical hypothesis, but rather that which is implied by both alike.' A true hypothesis is always a more inclusive conception, binding together facts which had hitherto been regarded as distinct; it reveals a mathematical order and harmony where before there had been unexplained diversity."
E.A. Burtt (1932) The Metaphysical Foundations of Modern Science. Reprinted 1954, Garden City NY: Doubleday Anchor. p.65. [Emphasis his].
"It is the vice or misfortune of thinkers about education to have chosen the methods of philosophy or of popular thought instead of those of science... Long after every statement about mental growth made in this book has been superseded by a truer one the method which it tries to illustrate will still be profitable and the ideals of accuracy and honesty in statistical procedure by which I hope it has been guided will still be honored. We conquer the facts of nature when we observe and experiment upon them. When we measure them we have made them our servants... The service rendered to physical science by the inch, the ounce, the ohm, the ampere, the calorie, etc., should be duplicated in mental science... Until we have such units all our investigations rest on insecure foundations."
Edward L. Thorndike (1903) Educational Psychology. New York: Lemcke and Buechner, pp.164-170.
"Rasch (1960) has devised a truly new approach to psychometric problems... He makes use of none of the classical psychometrics, but rather applies algebra anew to a probabilistic model. The probability that a person will answer an item correctly is assumed to be the product of an ability parameter pertaining only to the person and a difficulty parameter pertaining only to the item. Beyond specifying one person as the standard of ability and one item as the standard of difficulty, the ability assigned to an individual is independent of that of other members of the group and of the particular items with which he is tested; similarly for the item difficulty... Indeed, these two properties were once suggested as criteria for absolute scaling (Loevinger 1947); at that time proposed schemes for absolute scaling had not been shown to satisfy the criteria, nor does Guttman scaling do so. Thus, Rasch must be credited with an outstanding contribution to one of the two central psychometric problems, the achievement of non-arbitrary measures. Rasch is concerned with a different and more rigorous kind of generalization than Cronbach, Rajaratnam, and Gleser. When his model fits, the results are independent of the sample of persons and of the particular items within some broad limits. Within these limits, generality is, one might say, complete."
Jane Loevinger (1965) in Person and population as psychometric concepts. Psychological Review, 72(2), 143-155.
Loevinger, J. 1947. A systematic approach to the construction and evaluation of tests of ability. Psychological Monographs, 61(4)
"All the world is a cess-pool of raw data!"
"But we have to live in the data!"
"Happily, Rasch helps us clean up the mess."
John Michael Linacre
Quotes from different presentations at MOMS, Chicago, December 5, 1997
To speak or not to speak That is the question.
Whether it is better
to say out loud outrageous originalities
so new, so simple and so decisive
they dare the comfort of satisfied tradition,
rend the gentle fabric of self-assured complacency
strew into tatters the many cloaks
of decency, tact, diplomacy?
Or just, to rest mute and muffled,
swallowing the unspoken,
harsh meal of indigestibles?
and shrink into an ancient, ruined ball of dust!
Ben Wright (with apologies to William Shakespeare)
p. 101 in Ed Bouchard & Ben Wright, Kinesthetic Ventures. Chicago: MESA Press. 1997
Notes and Quotes Rasch Measurement Transactions, 1997, 11:3 p. 579, 585.
Please help with Standard Dataset 4: Andrich Rating Scale Model
|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|
|Forum||Rasch Measurement Forum to discuss any Rasch-related topic|
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|Coming Rasch-related Events|
|Sept. 15-16, 2017, Fri.-Sat.||IOMC 2017: International Outcome Measurement Conference, Chicago, jampress.org/iomc2017.htm|
|Oct. 13 - Nov. 10, 2017, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|Oct. 25-27, 2017, Wed.-Fri.||In-person workshop: Applying the Rasch Model hands-on introductory workshop, Melbourne, Australia (T. Bond, B&FSteps), Announcement|
|Jan. 5 - Feb. 2, 2018, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|Jan. 10-16, 2018, Wed.-Tues.||In-person workshop: Advanced Course in Rasch Measurement Theory and the application of RUMM2030, Perth, Australia (D. Andrich), Announcement|
|Jan. 17-19, 2018, Wed.-Fri.||Rasch Conference: Seventh International Conference on Probabilistic Models for Measurement, Matilda Bay Club, Perth, Australia, Website|
|April 13-17, 2018, Fri.-Tues.||AERA, New York, NY, www.aera.net|
|May 25 - June 22, 2018, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|June 29 - July 27, 2018, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com|
|Aug. 10 - Sept. 7, 2018, Fri.-Fri.||On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.com|
|Oct. 12 - Nov. 9, 2018, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
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