Abstract

-The aim of this paper is to propose Rasch's psychometric model as a special case of simultaneous additive conjoint measurement serviceable in Psychophysics. The essential character of conjoint measurement is described by an axiomatization for the comparison of effects of pairs formed from two specified kinds of parameters (subject ability and stimulus difficulty). On a theoretical level, this paper shows the relations between these two parameters and the psychophysical concept of sensory threshold.

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