Research Article
Research on the Impact of Expressway on the County Economy Based on a Spatial DID Model: The Case of Three Provinces of China
Table 7
The LM and Robust LM test results.
| | Index | Guangdong | value | Hubei | value | Qinghai | value |
| | LM-error | 28.851 | 0 | 112.477 | 0 | 92.711 | 0 | | Robust LM-error | 15.18 | 0 | 70.034 | 0 | 69.639 | 0 | | LM-lag | 26.59 | 0 | 66.034 | 0 | 27.328 | 0 | | Robust LM-lag | 12.919 | 0 | 23.591 | 0 | 4.256 | 0.039 |
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