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Unbalanced Repeated Measures with Random Coefficients
Authors:Yuan Wu  Clyde A McGilchrist
Abstract:In a random coefficient repeated measures model, the regression coefficients relating the observations to some underlying variable, such as time, are themselves taken to be random distributed over experimental units. In this paper, a general approach to repeated measures analysis is extended to this wider model. In the model three specific error structures for the random regression coefficients have been studied, viz, the random coefficients variance matrix is considered to be (i) diagonal, (ii) proportional to the identity matrix and (iii) completely general. An example will be analyzed to illustrate the procedure.
Keywords:Repeated measures  Random coefficients  ML  REML  Likelihood ratio test  AIC
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