I am comparing Covariance Structures and using; Unstructured, Variance Components, Compound Symmetry, Heterogeneous Compound Symmetry, Toeplitz, Heterogeneous Toeplitz, Autoregressive(1) and Heterogeneous Autoregressive(1). When running these for analysis, the 'covariance parameter estimates' are given, but I cannot decipher what most of them mean! Variance Components gives one number listed as time, which I can only assume is the Variance for all? Heterogeneous Compound Symmetry gives Individual variances and a 'CSH'? Toeplitz gives TOEP(2), TOEP(3), TOEP(4) and a residual. Heterogeneous Toeplitz gives Variances and TOEP(1), TOEP(2) and TOEP(3)? I was hoping someone may be able to explain what these parameters are in terms of their position in each Covariance Matrix? Thank you!
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