Research Article
Optimization Studies on Recovery of Metals from Printed Circuit Board Waste
Table 4
Coefficients in terms of coded factors for lead.
| | Factor | Coefficient estimate | DOF | Standard error | 95% CI low | 95% CI high | VIF |
| | Intercept | 66.36 | 1 | 3.98 | 56.96 | 75.76 | | | A-CD | 9.02 | 1 | 3.14 | 1.59 | 16.45 | 1.0000 | | B-solvent | 7.37 | 1 | 3.14 | −0.0573 | 14.80 | 1.0000 | | C-time | 6.42 | 1 | 3.14 | −1.01 | 13.85 | 1.0000 | | AB | 1.24 | 1 | 4.44 | −9.27 | 11.74 | 1.0000 | | AC | 0.1700 | 1 | 4.44 | −10.34 | 10.68 | 1.0000 | | BC | −7.15 | 1 | 4.44 | −17.66 | 3.36 | 1.0000 | | A2 | −18.62 | 1 | 4.33 | −28.86 | −8.38 | 1.01 | | B2 | −1.67 | 1 | 4.33 | −11.91 | 8.57 | 1.01 | | C2 | −1.82 | 1 | 4.33 | −12.06 | 8.43 | 1.01 |
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