Table 4.
Regression statistics of FCCD, regression coefficients and analysis of variance (ANOVA) for FCCD results used for cadmium removal percentage by Ulva fasciata.
| Source | F-value | P-value Prob > F | Coefficient estimate |
|---|---|---|---|
| Model | 29.497 | <0.0001* | 98.351 |
| X1 - (Cadmium conc., mg/L) | 25.975 | 0.0005* | 1.833 |
| X2 - (pH) | 0.160 | 0.6973 | −0.144 |
| X3 - (Biomass conc., g/L) | 60.698 | <0.0001* | −2.802 |
| X1 X2 | 16.206 | 0.0024* | −1.619 |
| X1 X3 | 75.710 | <0.0001* | 3.499 |
| X2 X3 | 3.799 | 0.0799 | 0.784 |
| X12 | 61.339 | <0.0001* | −5.371 |
| X22 | 11.380 | 0.0071* | 2.314 |
| X32 | 0.567 | 0.4689 | −0.516 |
| Std. Dev. | 1.137 | R-Squared | 0.9637 |
| Mean | 96.564 | Adj R-Squared | 0.9310 |
| C.V.% | 1.178 | Pred R-Squared | 0.8776 |
| PRESS | 43.628 | Adeq Precision | 20.4227 |
*Significant values, F: Fishers’s function, P: Level of significance.
Lack of Fit: 1.241; lack of fit P-value = 0.4094.