Table 4.
Parameter estimates for outer and inner diameter by stem taper equations.

Max and Burkhart			Kozak			Lee
Parameter	Outer diameter	Inner diameter	Parameter	Outer diameter	Inner diameter	Parameter	Outer diameter	Inner diameter
a1	0.4844	0.3176	a0	0.7828	0.4416	b1	1.2483	0.7103
a2	0.0291	−0.2408	a1	1.1974	1.3705	b2	0.9505	1.0528
b1	−2.7972	−1.8699	a2	0.9780	0.9726	c1	0.5245	−0.7623
b2	1.3748	0.9378	b1	1.2956	1.1016	c2	−0.5448	1.6388
b3	−1.2743	−2.8378	b2	−0.2917	−0.1417	c3	1.0113	0.0957
b4	392.8324	1714.11	b3	2.8436	2.3588	−	−	−
−	−	−	b4	−1.2922	−1.0278	−	−	−
−	−	−	b5	0.2301	0.3136	−	−	−