RMT 20:4 Linking Terminology: Raw Score and Rasch

Linking Terminology: Raw Score and Rasch
Term	Linn & Mislevy meaning	Rasch meaning
Linking	general term for making the results of different tests comparable	enabling the data to be analyzed together in one analysis (if desired) to construct one overall set of measures
Equating	correspondence of raw scores between tests	putting the measures in the same frame of reference
Calibration	putting the scores in the same frame of reference	constructing item measures in the internal frame of reference
Projection	scores on one test weakly predict scores on another test	(a height-weight situation)
Moderation	equivalences based on matching up sample statistics	(Fahrenheit-Celsius equating)
Anchoring (fixing)	-	measures obtained from one analysis (or construct theory) imposed on another to place it in the same frame of reference.
Local origin	zero score or sample mean	reference location from which to measure along the latent variable
Linn, R. L. (1993). Linking results of distinct assessments. Applied Measurement in Education, 6, 83-102. Mislevy, R. J. (1992). Linking educational assessments: Concepts, issues, and prospects. Princeton, NJ: Educational Testing Service.

Linking Terminology: Raw Score and Rasch, … Rasch Measurement Transactions, 2007, 20:4 p. 1076