Table 3.

Estimated parameter values.

parameter	heterogeneous model	homogeneous model
γ	0.98 [0.95, 1.00]a	n.a.
α	0.15 [0.00, 0.56]a	n.a.
σ	0.51 [0.00, 2.37]a	3.87 [1.61, 7.79]a
residual sum of squares	0.30	0.74
standard error estimate	0.16	0.24
F-test	8.12 (0.007)b	n.a.
log-likelihood test	12.70 (0.002)b	n.a.

^aMode [95% CI]. ^bScore (p-value).