Research Article
Optimization Studies on Recovery of Metals from Printed Circuit Board Waste
Table 10
Coefficients in terms of coded factors for copper.
| | Factor | Coefficient estimate | DOF | Standard error | 95% CI low | 95% CI high | VIF |
| | Intercept | 48.00 | 1 | 0.9629 | 45.78 | 50.22 | | | A-CD | 24.00 | 1 | 0.8339 | 22.08 | 25.92 | 1.0000 | | B-solvent | 8.25 | 1 | 0.8339 | 6.33 | 10.17 | 1.0000 | | C-time | 15.50 | 1 | 0.8339 | 13.58 | 17.42 | 1.0000 | | AB | 0.5000 | 1 | 1.18 | −2.22 | 3.22 | 1.0000 | | AC | 7.50 | 1 | 1.18 | 4.78 | 10.22 | 1.0000 | | BC | 2.50 | 1 | 1.18 | −0.2193 | 5.22 | 1.0000 | | A2 | −6.50 | 1 | 1.13 | −9.10 | −3.90 | 1.02 | | B2 | 8.00 | 1 | 1.13 | 5.40 | 10.60 | 1.02 | | C2 | 1.50 | 1 | 1.13 | −1.10 | 4.10 | 1.02 |
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