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. Author manuscript; available in PMC: 2014 May 14.
Published in final edited form as: Stat Med. 2010 Jul 30;29(17):1825–1838. doi: 10.1002/sim.3928

Figure 1.

Figure 1

(a) Plot of the various correlation patterns that can be obtained by varying the parameter δ while keeping ρ constant. δ = 19 corresponds to an AR(1) decay rate, whereas δ = 0 corresponds to compound symmetry; (b) Plot of the various correlation patterns that can be obtained by varying the parameter ρ while keeping δ constant; and (c) Plot of the various correlation patterns that can be obtained with larger values of δ while keeping ρ constant. Again δ = 19 corresponds to an AR(1) decay rate.