Table 6. Significance test of regression coefficienta.
Variable | Coefficient | Std. Error | t-Value | p-Value |
---|---|---|---|---|
Intercept | 2.002 | 0.0088 | 227.04 | <0.0001b |
X1 | −0.0894 | 0.0070 | −12.83 | <0.0001b |
X2 | 0.0211 | 0.0070 | 3.03 | 0.0191b |
X1X2 | −0.0125 | 0.0098 | −1.27 | 0.2454 |
X1X1 | −0.1329 | 0.0075 | −17.77 | <0.0001b |
X2X2 | −0.1579 | 0.0075 | −21.12 | <0.0001b |
aR2 = 0.9918, R2 (Adj) = 0.986. bStatistical signification at 95% of confidence level (p < 0.05).