Table 3. -2log likelihood, χ2 value and the corresponding P-value of likelihood ratio.
| Model | -2logL | ?2-valuea) | P-value |
| MA | 18019.6 | ||
| MAE | 18017.8 | 1.8 | 0.180 |
| MAD | 18015.9 | 3.7 | 0.054 |
| MAED | 18014.2 | 5.4 | 0.067 |
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