Robustness test
| Pilot year | (1) | (2) | (3) | (4) | (5) | (6) | (7) |
|---|---|---|---|---|---|---|---|
| Over years | 2009 | 2010 | 2011 | 2012 | 2013 | Multiple years | |
| Test | 0.373*** (0.043) | 0.524*** (0.056) | 0.387*** (0.040) | 0.276*** (0.038) | 0.225*** (0.038) | 0.232*** (0.036) | 0.135*** (0.008) |
| Constant | −2.782*** (0.505) | −1.788*** (0.253) | 1.138*** (0.306) | 1.410*** (0.302) | 1.463*** (0.300) | 1.493*** (0.298) | 0.334*** (0.049) |
| Control variable | YES | YES | YES | YES | YES | YES | YES |
| Individual fixation | YES | YES | YES | YES | YES | YES | YES |
| Fixed time | YES | YES | YES | YES | YES | YES | YES |
| N | 867 | 3,315 | 3,525 | 3,581 | 3,623 | 3,763 | 3,414 |
| R2 | 0.929 | 0.961 | 0.968 | 0.967 | 0.967 | 0.967 | 0.307 |
| Pilot year | (1) | (2) | (3) | (4) | (5) | (6) | (7) |
|---|---|---|---|---|---|---|---|
| Over years | 2009 | 2010 | 2011 | 2012 | 2013 | Multiple years | |
| 0.373*** (0.043) | 0.524*** (0.056) | 0.387*** (0.040) | 0.276*** (0.038) | 0.225*** (0.038) | 0.232*** (0.036) | 0.135*** (0.008) | |
| −2.782*** (0.505) | −1.788*** (0.253) | 1.138*** (0.306) | 1.410*** (0.302) | 1.463*** (0.300) | 1.493*** (0.298) | 0.334*** (0.049) | |
| Control variable | YES | YES | YES | YES | YES | YES | YES |
| Individual fixation | YES | YES | YES | YES | YES | YES | YES |
| Fixed time | YES | YES | YES | YES | YES | YES | YES |
| 867 | 3,315 | 3,525 | 3,581 | 3,623 | 3,763 | 3,414 | |
| 0.929 | 0.961 | 0.968 | 0.967 | 0.967 | 0.967 | 0.307 |
Note(s): *, ** and *** indicate that the regression coefficient is significant at the levels of 10%, 5% and 1%, respectively
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