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Graphical illustration of two link functions in the (a) matrix-logarithmic and (b) geodesic models. In (a), the link function for the matrix-logarithmic model equals Σ(x, β) = exp(g(x, β)) or log(Σ(x, β)) = g(x, β). In (b), the link function for the geodesic model equals LogD(Σ(x, β)) = g(x, β), where D is the intercept matrix.
