Table 3 Pairwise correlations and multicollinearity test.
Variables | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | VIF | Tolerance value |
|---|---|---|---|---|---|---|---|---|---|---|
(1) LnCO2 | 1.000 | |||||||||
(2) LnN2O | 0.294 | 1.000 | ||||||||
(3) LnCH4 | 0.070 | 0.659 | 1.000 | |||||||
(4) LnFD | 0.354 | −0.184 | −0.411 | 1.000 | 1.836 | 0.545 | ||||
(5) LnGDP | 0.805 | −0.021 | −0.360 | 0.415 | 1.000 | 3.36 | 0.298 | |||
(6) LnKOFGI | 0.574 | 0.278 | −0.304 | 0.404 | 0.699 | 1.000 | 4.252 | 0.235 | ||
(7) LnGDS | 0.715 | 0.142 | −0.210 | 0.568 | 0.680 | 0.532 | 1.000 | 2.663 | 0.375 | |
(8) IQ | 0.379 | 0.200 | −0.307 | 0.292 | 0.614 | 0.753 | 0.441 | 1.000 | 2.528 | 0.396 |