Table 5.
Test statistics for outer and inner diameter by stem taper equations.

Model	Max and Burkhart		Kozak		Lee
	Outer diameter	Inner diameter	Outer diameter	Inner diameter	Outer diameter	Inner diameter
FI*	0.9883	0.9852	0.9890	0.9865	0.9862	0.9856
SEE	0.3954	0.3576	0.3825	0.3414	0.4299	0.3530
Bias	0.0097	−0.0166	−0.0027	−0.0043	0.0045	−0.0023
MAD	0.2685	0.2601	0.2599	0.2463	0.2926	0.2545

FI : Fitness index, SEE : Standard error of estimate as percent of the mean, MAD : Mean absolute difference