Abstract
For the analysis of square contingency tables with ordered categories, this paper introduces the quasidiagonalsparameter symmetry (QDPS) model which is an extension of the quasisymmetry (QS) model. It is shown that the QDPS model is preferable to the QS model for unaided vision data of British women earlier analysed by Stuart (1955). Various extended models of QS are expressed in terms of the local odds ratios and the other odds ratios.
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