In this paper, we present a methodology for determining the degree of concordance between observed and model-based predicted values of a mixed-effect model. In particular, we will compare the degree to which observed and model-based predicted values agree by using ‘method of comparison’ techniques. We will also present the results of the concordance correlation coefficient (CCC).
McCarthy, William F. and Guo, Nan, "The Assessment of the Degree of Concordance Between the Observed Values and the Predicted Values of a Mixed-Effect Model Using “Method of Comparison” Techniques" (July 2007). COBRA Preprint Series. Working Paper 25.