Table 4. Estimated parameters values and turning points associated with three
pollutants obtained from the one way random effect model.
|
Specification |
Social Capital |
Social |
Social |
Population Density |
F- |
R2 | |
|
Nitrogen |
Quadratic |
-1.360” |
2.530** |
-0.002* |
______** 15.29 |
0.0980 | |
|
(-3.52) |
(5.97) |
(-2.86) | |||||
|
Cubic |
2.230** |
_ _ _ ** -7.940** |
7.090** |
-0.0002* |
7.75 |
0.1449 | |
|
(2.95) |
(-4.03) |
(5.40) |
(2.26) | ||||
|
Phosphorus |
Quadratic |
-0.236 |
0.234 |
-0.00002 |
2.33 |
0.0053 | |
|
(-1.46) |
(1.38) |
(-0.53) | |||||
|
Cubic |
0.110 |
-0.750 |
0.652 |
-0.00002 |
1.78 |
0.0081 | |
|
(0.33) |
(-0.90) |
(1.20) |
(-0.35) | ||||
|
Dissolved |
Quadratic |
-2.355 |
3.300 |
0.0004 |
4.20 |
0.0097 | |
|
(1.35) |
(1.81) |
(0.88) | |||||
|
Oxygen |
Cubic |
-4.273 |
8.767 |
-3.629 |
0.0004 |
3.86 |
0.0103 |
|
(-1.19) |
(0.97) |
(-0.62) |
(0.78) |
1 Values inside the parentheses indicate t-stat for the parameters and. * represents
value is significant at 5%, ** indicates value significant at 1%.
25