Table 2 Table of analytic models and specifications for \(\textbf{G}\) and \(\textbf{R}\) matrices, along with the number of covariance parameters. A hyphen in the R matrix columns indicates that no R-matrix type was specified. For the parameters, numbers appearing to the left of the comma pertain to analytic models containing time × group random effects, while numbers to the right pertain to analytic models containing only group-intercept random effects. Values appearing in parentheses correspond to to the number of covariance parameters for the mean model. Note that Saturated analytic models did not fit time-invariant group random effects

From: Analysis of multiple-period group randomized trials: random coefficients model or repeated measures ANOVA?