Table 3. Estimated parameters values and turning points associated with three
pollutants obtained from the two way fixed effect model.
|
Specification |
Social Capital |
S.Capital |
S.Capital |
Population |
F- |
R2 | |
|
Nitrogen |
Quadratic |
-2.765 |
3.895 |
N/A |
0.001 |
14.95 |
0.699 |
|
(-2.62) |
(5.28) |
(1.40) | |||||
|
Cubic |
1.282 |
-5.694 |
5.813 |
0.001 |
12.97** |
0.704 | |
|
(0.74) |
(1.70) |
(2.94) |
(1.50) | ||||
|
Phosphorus |
Quadratic |
-0.587 |
0.500 |
N/A |
0.0001 |
23.38** |
0.757 |
|
(-1.51) |
(1.85) |
(.36) | |||||
|
Cubic |
-0.069 |
-0.728 |
0.745 |
0.0001 |
23.29** |
0.757 | |
|
(0.11) |
(0.59) |
(1.02) |
(0.39) | ||||
|
Dissolved |
Quadratic |
8.43 |
-3.79 |
N/A |
-0.004 |
24.57** |
0.788 |
|
(2.05) |
(1.32) |
(1.44) | |||||
|
Oxygen |
Cubic |
14.263 |
-17.607 |
8.373 |
-0.004 |
24.60** |
0.788 |
|
(2.10) |
(1.34) |
(1.08) |
(1.40) |
1 Values inside the parentheses indicate t-value. * represents value is significant at
5%.
24
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