Yesterday's talk [Feb. 19, 2001], "DNA Fingerprinting," by the University of Chicago's Michael Linacre at the LSU HSC Dept of Genetics was attended by more than 25 people. Linacre presented a basic contrast of the differing purposes motivating the use of mathematical models in statistical and measurement research. He passed around a Ptolemaic astrolabe [courtesy of Tom O'Neill] as an illustrative artifact of the days when Ptolemy's descriptively superior account of the heavenly bodies was held also to be theoretically superior to the Copernican account. Most statistical studies of test, survey, and genetic data are similar to the Ptolemaic system in achieving accurate data description, but will eventually fall to theoretically superior measurement accounts that support enhanced predictive capacities, just as Ptolemy's system fell when confronted with Newton's laws of motion.
Mike then recapitulated his analysis of Geyer & Thompson's (1992) DNA fingerprinting data [RMT 7:1, 274], showing how a probabilistic conjoint (Rasch) measurement model for genetic diversity can provide a measure of relatedness. Mike also showed the results of his recent examination of data from a popular textbook comparing genetic frequencies across different global regions. In taking up this topic, with no prior knowledge of the personal connection or the work that was done, Mike cited a researcher (Morton) with whom Bronya Keats, Head of the Dept. of Genetics, had worked, and furthermore took the analysis in the same direction that Keats and Morton had 25 years previously when working with similar data. Of special interest in this work was the use of "lods," log-odds units, known in Rasch measurement as logits. After the seminar, Keats provided Linacre with reprints of the published work she did with Morton; these articles include tables of data which Linacre plans to evaluate in a Rasch context. Stay posted for a comparison of lods and logits ....
William P. Fisher, Jr.
Fisher, W.P. Jr. (2001) "DNA Fingerprinting" Redivivus. Rasch Measurement Transactions 14:4 p.785
"DNA Fingerprinting" Redivivus. Fisher, W.P. Jr. Rasch Measurement Transactions, 2001, 14:4 p.785
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|
Go to Top of Page
Go to index of all Rasch Measurement Transactions
AERA members: Join the Rasch Measurement SIG and receive the printed version of RMT
Some back issues of RMT are available as bound volumes
Subscribe to Journal of Applied Measurement
Go to Institute for Objective Measurement Home Page. The Rasch Measurement SIG (AERA) thanks the Institute for Objective Measurement for inviting the publication of Rasch Measurement Transactions on the Institute's website, www.rasch.org.
|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|
|The HTML to add "Coming Rasch-related Events" to your webpage is:|
The URL of this page is www.rasch.org/rmt/rmt144j.htm