Table 3. AIC and some performance measures of the taper equation for the five best combinations of random-effects parameters.

Parameters with random effects	AIC	BIAS	MAB	RMSE	FI
Nonea	18260.86	−0.0110	0.8434	1.1013	0.9874
β1, β5, β6	15666.05	−0.0081	0.4818	0.6262	0.9959
β1, β4, β7	15672.12	−0.0115	0.4880	0.6327	0.9958
β2, β4, β7	15684.31	−0.0113	0.4926	0.6373	0.9958
β2, β4, β5	15684.31	−0.0101	0.4887	0.6325	0.9958
β1, β7	16556.33	−0.0097	0.5960	0.7769	0.9937

Fixed-effects model