Table 4. Individual fixed-effect model results and robustness tests.
| Variables | Model (1) | Model (2) | Model (3) | Model (4) |
|---|---|---|---|---|
| digit | 0.8051***a (0.0313) b |
0.7267*** (0.0296) |
|
0.7892*** (0.0459) |
| L.digit | 0.7062*** (0.0368) |
|||
| digit 2 | -0.1690*** (0.0354) |
-0.1783*** (0.0335) |
-0.1572*** (0.0435) |
|
| L.digit2 | -0.1394*** (0.0454) |
|||
| open | 0.0026*** (0.0003) |
0.0025*** (0.0003) |
0.0024*** (0.0004) |
0.0026** (0.0003) |
| basein | 0.0158 (0.0216) |
0.0311 (0.0185) |
0.0136** (0.0200) |
0.0296 (0.0062) |
| govern | -0.0302*** (0.0243) |
-0.0203*** (0.0071) |
-0.0221** (0.0081) |
-0.0295*** (0.0084) |
| province×year | 0.0102*** (0.0216) |
|||
| constant | 0.2083*** (0.0243) |
0.2037*** (0.0234) |
0.2505*** (0.0274) |
-1.5805*** (0.5775) |
| Obs | 372 | 310 | 341 | 372 |
| R 2 | 0.9018 | 0.8889 | 0.8871 | 0.9223 |
a *, **, *** indicate a significance level of 10%, 5% and 1%, respectively.
b Values in () are standard errors.