| 系数 | 标准偏差 | | 底价 | | EXPER | -0.006 | (0.001) | | INVENTORY | 0.139*** | (0.069) | | SHIPCOST | -0.650 | (0.449) | | POSFB | 8.649 | (18.040) | | RETURN | 27.748*** | (4.697) | | CONSTANT | 67.943*** | (18.102) | | 样本选择式(selection equation) | | EXPER | 0.0001*** | (0.00004) | | INVENTORY | 0.018** | (0.009) | | SHIPCOST | -0.019* | (0.010) | | POSFB | -21.164*** | (4.937) | | RETURN | 0.054 | (0.100) | | POSTDUR | 0.343*** | (0.028) | | CONSTANT | 20.981*** | (4.910) | | Inverse Mill's Ratio | -44.517*** | (9.336) | | $ \rho $ | -0.633{***} | (0.133) | | $ \sigma $ | 70.329 | | | Wald $ \chi^2 $(5) | 42.23 | | p-value | 0.000 | | 样本数 | 1186 | | 截断样本数 | 244 | | 未截断样本数 | 942 |
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