Table 6. Coefficient estimates and related statistics in the balanced highest-order model

Coefficient	Estimate	SE	t-value	p-value
Intercept	29.25557	0.1725	169.61	<0.0001
X1	−3.91665	0.2112	−18.54	0.0029
X2	−0.45000	0.2112	−2.13	0.1669
X12	2.92778	0.2727	10.74	0.0086
X22	−0.60557	0.2727	−2.22	0.1565
X1X2	1.44998	0.1494	9.71	0.0104
X1X22	3.76662	0.2587	14.56	0.0047
X12X2	3.13333	0.2587	12.11	0.0067
X12X22	−2.99446	0.3759	−7.97	0.0154