Table 8.

Estimated parameters of the profiles for the two-stage piston manufacturing process.

					The first gamma-distributed random error		The second gamma-distributed random error
$A_0$	$A_1$	ϕ	$B_1$	$B_2$	$\alpha$	$\mathrm{\text{β}}$	$\alpha$	$\mathrm{\text{β}}$
74.11	−0.013	0.21	55.12	−0.034	4.22	3.75	4.22	3.83