Key points are not available for this paper at this time.
In several recent studies the effects of mobility or status inconsistency on a dependent variable have been quantified by means of an an additive model in which sets of constants have been fitted to two principles of classification. In examining a particular application of this model, the following paper begins by suggesting the possibility that the underlying hypothesis may be more adequately represented by a symmetrical model which fits one and the same set of constants to both principles of classification.
Keith Hope (Wed,) studied this question.