Table 2.

Model comparison for the SHR example

	Model	Number of free parameters/rat	k	log(ML)	AICc	Δ
Phase 1	Default (unconstrained)	9	108	−15810	31839	22
	c = 0	8	96	−15812	31817	0
	Ω = 0	8	96	−15903	32000	183
	c, Ω = 0	7	84	−15903	31976	159
Phase 2	Default (c = 0)	8	96	−15812	31817	0
	γ = 0	7	84	−15891	31952	135
	α = 0	7	84	−15895	31960	143
	γ, α = 0	6	72	−16127	32399	582
	γ = α = β	6	72	−16084	32313	496

Note. Each model is identified by its constraints (Model column). The default model for Phase 2 is the model selected (lowest Δ) in Phase 1. The total number of observations, n, was 9542. The number of rats, N, was 12.