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Published online by Cambridge University Press: 01 January 2025
A general model for two-level multivariate data, with responses possibly missing at random, is described. The model combines regressions on fixed explanatory variables with structured residual covariance matrices. The likelihood function is reduced to a form enabling computational methods for estimating the model to be devised.
This work was partly supported by a grant from the Economic and Social Research Council (UK) for the author's Visiting Fellowship to the Multilevel Project at the Institute of Education London University. Thanks are also due to Harvey Goldstein for his advice and encouragement, and to John Robinson and Malcolm Hudson for their comments on the manuscript.