(1) | (2) | (3) | (4) | |
---|---|---|---|---|
Unilateral | ||||
First 2 years | 0.325** (0.126) | 0.141*** (0.0449) | 0.164*** (0.0406) | 0.139*** (0.0476) |
Years 3 and 4 | 0.378** (0.148) | 0.260*** (0.0541) | 0.236*** (0.0586) | 0.160* (0.0853) |
5 years or more | 0.448* (0.263) | 0.286*** (0.0960) | 0.0972 (0.113) | − 0.0232 (0.159) |
Adjusted R2 | 0.033 | 0.912 | 0.961 | 0.968 |
Year effects | No | Yes, F = 10.63 | Yes, F = 1.31 | Yes, F = 1.68 |
Prob > F | 0.000 | 0.222 | 0.085 | |
State effects | No | Yes, F = 109.5 | Yes, F = 107.9 | Yes, F = 71.9 |
Prob > F | 0.000 | 0.000 | 0.000 | |
State trend, linear | No | No | Yes, F = 13.67 | Yes, F = 3.28 |
Prob > F | 0.000 | 0.000 | ||
State trend, quadratic | No | No | No | Yes, F = 2.80 |
Prob > F | 0.000 | |||
Equality of coefficients | F = 0.10 | F = 2.43 | F = 2.55 | F = 1.70 |
Prob > F | 0.900 | 0.090 | 0.080 | 0.185 |
Total of observations | 352 | 352 | 352 | 352 |