Relationships between the Rasch model and both the law of comparative judgment and additive conjoint measurement are discussed. The distance between the ability of Person a and the difficult of Item i is, in the Rasch model, the baseline value corresponding to the probability that a will respond correctly to i, where this probability is interpreted as the area under a logistic curve (which is substantially equivalent to the normal curve) and is thus an application of the law of comparative judgment. Under certain assumptions, the Rasch model is also a special case of additive conjoint measurement and, properly reinterpreted, may be usefully applied in contexts other than individual differences. © 1977 Psychometric Society.
CITATION STYLE
Brogden, H. E. (1977). The rasch model, the law of comparative judgment and additive conjoint measurement. Psychometrika, 42(4), 631–634. https://doi.org/10.1007/BF02295985
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