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The list of potential correlation structures in wgee.
| Name | R(ρ) |
|---|---|
| Independence | Cor(Yij, Yij′) = 0, j ≠ j′ |
| Exchangeable | Cor(Yij, Yij′) = ρ, j ≠ j′ |
| First-order Autoregressive (AR1) | Cor(Yij, Yij′) = ρ|j–j’|, j ≠ j′ |
| Unstructured | Cor(Yij, Yij′) = ρjj’, j ≠ j′ |
