Paper in Theory & Systems
- Michell, J. (2008) Conjoint Measurement and the Rasch Paradox. A Response to Kyngdon. Theory & Systems, 18(1): 119-124.
Unlike Andrew Kyngdon, I think the issue he has addressed is most informatively considered outside the confines of the representational theory of measurement. Then it becomes clear that while the theory of conjoint measurement is about situations like that treated by the Rasch model, the former isolates a different feature of those situations to the latter. But, if the relevant attributes are already presumed to be quantitative, the perceived differences are minimized and the Rasch model might seem to be a version of conjoint measurement. It is on this basis that Rasch modellers pursue their paradoxical quest for measurement. However, because the relevant attributes are not actually known to be quantitative, use of the Rasch model to measure psychological attributes remains logically dependent upon the outcome of research involving the theory of conjoint measurement or something very similar.