| 变量代码 | X1 | X2 | X3 | X4 | P2 |
| X1 X2 X3 X4 P2 | 1 0.88968 0.583122 −0.366877 0.018129 | 0.88968 1 0.457826 −0.421722 0.018924 | 0.583122 0.457826 1 −0.444024 0.110293 | −0.366877 −0.421722 −0.444024 1 −0.120473 | 0.018129 0.018924 0.110293 −0.120473 1 |