Ramon E. Henkel, Part-Whole Correlations and the Treatment of Ordinal and Quasi-Interval Data as Interval Data, The Pacific Sociological Review, Vol. 18, No. 1 (Jan., 1975), pp. 3-26 ...

Existing methods for the analysis of clustered, ordinal data are inappropriate for certain applications. We propose latent variable models for clustered ordinal data which are derived as natural ...