Table 5. Estimated parameters values and turning points associated with three
pollutants obtained from the two way random effect model.
Specification |
Social Capital |
Social |
Social |
Population |
F- |
R2 | |
Nitrogen |
Quadratic |
----Σ--W--- -1.500 (-3.88) |
2.590** |
-0.0003* |
—τ—__VV— 9.88 |
0.09 | |
Cubic |
2.020* |
___VV -7.470 (-3.78) |
6.790** (5.16) |
-0.0002* (2.65) |
4.90 |
0.14 | |
Phosphorus |
Quadratic |
-0.226 (-1.39) |
0.240 (1.43) |
-0.00003 |
1.78 |
0.01 | |
Cubic |
0.188 (0.56) |
-0.920 (-1.09) |
0.765 (1.40) |
-0.00002 (-0.42) |
0.83 |
0.01 | |
Dissolved Oxygen |
Quadratic |
-1.740 (-0.32) |
3.000 (0.09) |
0.0003 |
9.52* |
0.01 | |
Cubic |
-2.751 (-0.75) |
5.868 |
-1.901 (-0.32) |
0.0003 |
10.55* |
0.01 |
1 Values inside the parentheses indicate t-stat for the parameters and. * represents
value is significant at 5%, ** indicates value significant at 1%.
26
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