Model 1 | Model 2 | Model 3 | Model 4 | |
---|---|---|---|---|
Constant | −2.21* (− 1.76) | 2.43*** (3.96) | − 2.74** (− 2.31) | 2.45*** (6.69) |
Population | − 0.18*** (− 5.30) | − 0.19*** (− 5.45) | −0.19*** (− 5.80) | −0.20*** (− 9.26) |
Demand | 0.51*** (5.32) | 0.57*** (6.14) | ||
Demand2 | 0.20*** (5.24) | 0.24*** (8.76) | ||
Adjusted R2 | 0.70 | 0.70 | 0.74 | 0.77 |
Standard error | 0.29 | 0.30 | 0.27 | 0.26 |