Table 3.

Correlation coefficient between input-output variables.

	${\mathit{x}}_{\mathbf{1}}$	${\mathit{x}}_{\mathbf{2}}$	${\mathit{y}}^{\mathit{g}}$	${\mathit{y}}_{\mathbf{1}}^{\mathit{b}}$	${\mathit{y}}_{\mathbf{2}}^{\mathit{b}}$	${\mathit{y}}_{\mathbf{3}}^{\mathit{b}}$
${\mathit{x}}_{\mathbf{1}}$	1
${\mathit{x}}_{\mathbf{2}}$	0.78	1
${\mathit{y}}^{\mathit{g}}$	0.37	0.56	1
${\mathit{y}}_{\mathbf{1}}^{\mathit{b}}$	−0.26	−0.16	−0.12	1
${\mathit{y}}_{\mathbf{2}}^{\mathit{b}}$	−0.18	−0.08	−0.48	0.16	1
${\mathit{y}}_{\mathbf{3}}^{\mathit{b}}$	−0.26	−0.09	−0.13	0.06	0.42	1