Table 4.

Correlation matrix.

	x1	x2	x3	x1*x1	x2*x2	x3*x3	x1*x2	x1*x3	x2*x3	Y1	Y2
x1	1	−0.048	0.104	0.004	0.097	0.100	−0.086	0.048	−0.072	0.088	−0.505
x2	−0.048	1	−0.070	0.010	0.040	0.015	0.051	−0.067	0.050	0.674	−0.182
x3	0.104	−0.070	1	0.010	0.026	0.040	−0.072	0.051	−0.075	−0.052	−0.210
x1*x1	0.004	0.010	0.010	1	0.492	0.382	−0.041	0.060	−0.043	−0.463	0.078
x2*x2	0.097	0.040	0.026	0.492	1	0.578	−0.037	−0.035	−0.035	−0.423	−0.179
x3*x3	0.100	0.015	0.040	0.382	0.578	1	0.011	−0.011	−0.103	−0.361	−0.120
x1*x2	−0.086	0.051	−0.072	−0.041	−0.037	0.011	1	−0.084	0.047	0.123	0.274
x1*x3	0.048	−0.067	0.051	0.060	−0.035	−0.011	−0.084	1	−0.020	−0.303	0.544
x2*x3	−0.072	0.050	−0.075	−0.043	−0.035	−0.103	0.047	−0.020	1	0.149	−0.067
Y1	0.088	0.674	−0.052	−0.463	−0.423	−0.361	0.123	−0.303	0.149	1	−0.240
Y2	−0.505	−0.182	−0.210	0.078	−0.179	−0.120	0.274	0.544	−0.067	−0.240	1

Significant correlations are identified in bold.