(1) | (2) | (3) | (4) | |
---|---|---|---|---|
Unilateral | ||||
First 2 years | 0.292*** (0.0909) | 0.184*** (0.0407) | 0.181*** (0.0403) | 0.145*** (0.0469) |
Years 3 and 4 | 0.321*** (0.106) | 0.255*** (0.0490) | 0.244*** (0.0581) | 0.157* (0.0842) |
5 years or more | 0.337* (0.189) | 0.267*** (0.0871) | 0.142 (0.112) | − 0.00525 (0.157) |
Adjusted R2 | 0.050 | 0.862 | 0.928 | 0.940 |
Year effects | No | Yes, F = 5.99 | Yes, F = 1.24 | Yes, F = 1.40 |
Prob > F | 0.000 | 0.265 | 0.179 | |
State effects | No | Yes, F = 65.15 | Yes, F = 37.27 | Yes, F = 25.25 |
Prob > F | 0.000 | 0.000 | 0.000 | |
State trend, linear | No | No | Yes, F = 9.98 | Yes, F = 2.09 |
Prob > F | 0.000 | 0.001 | ||
State trend, quadratic | No | No | No | Yes, F = 2.89 |
Prob > F | 0.000 | |||
Equality of coefficients | F = 0.04 | F = 1.03 | F = 1.68 | F = 1.27 |
Prob > F | 0.964 | 0.358 | 0.187 | 0.281 |
Total of observations | 352 | 352 | 352 | 352 |