| correlation | Y | X1 | X2 | X3 |
| Y | 1.0000 | 0.9857 | 0.9171 | 0.9754 |
| X1 | 0.9857 | 1.0000 | 0.9153 | 0.9566 |
| X2 | 0.9171 | 0.9153 | 1.0000 | 0.8395 |
| X3 | 0.9754 | 0.9566 | 0.8395 | 1.0000 |