| 变量 | 2014年SDM的参数取值 | 2018年SDM的参数取值 |
| x1 | 0.029133 (0.275618) | 0.006305 (0.060593) |
| x2 | 0.269634*** (3.156949) | −0.134755 (−1.485517) |
| x3 | 0.269634*** (3.156949) | 0.138115* (1.688688) |
| x4 | −0.849993*** (−4.281319) | −0.802316*** (−4.627608) |
| x5 | 0.121641 (0.711453) | 0.131831 (0.925188) |
| x6 | 0.206107* (1.777561) | 0.213403* (1.931041) |
| Wx1 | 0.29365* (1.662128) | −0.03223 (−0.198391) |
| Wx2 | 0.356642** (2.399239) | −0.028076 (0.154228) |
| Wx3 | 0.222667 (1.468233) | −0.048537 (−0.322248) |
| Wx4 | 0.195778 (0.53785) | 0.961983*** (3.211291) |
| Wx5 | −0.329845 (−1.009665) | 0.189765 (0.583071) |
| Wx6 | −0.338871* (−1.742468) | −0.329914** (−2.060905) |
| ρ | 0.073982 (0.501733) | 0.472967*** (4.280806) |
| R2 | 0.5373 | 0.3418 |
| Log-likelihood | 26.006966 | 21.826155 |