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50 Years of ERIC
50 Years of ERIC
The Education Resources Information Center (ERIC) is celebrating its 50th Birthday! First opened on May 15th, 1964 ERIC continues the long tradition of ongoing innovation and enhancement.

Learn more about the history of ERIC here. PDF icon

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Historical Views of Invariance: Evidence from the Measurement Theories of Thorndike, Thurstone, and Rasch.
Peer reviewed Peer reviewed
Engelhard, George, Jr. – Educational and Psychological Measurement, 1992
A historical perspective is provided of the concept of invariance in measurement theory, describing sample-invariant item calibration and item-invariant measurement of individuals. Invariance as a key measurement concept is illustrated through the measurement theories of E. L. Thorndike, L. L. Thurstone, and G. Rasch. (SLD)
Descriptors: Behavioral Sciences, Educational History, Measurement Techniques, Psychometrics