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Model of b*–Zn–Fe stepwise regression.
| model | factors | unstandardized | standardized | T | sig | R2 | adjusted R2 |
|---|---|---|---|---|---|---|---|
| 1 | constant | 29.094 | — | 9.999 | 0.000 | 0.857 | 0.853 |
| CuO (%) | −2.477 | −0.926 | −14.064 | 0.000 | |||
| 2 | constant | 24.126 | — | 7.615 | 0.000 | 0.886 | 0.879 |
| CuO (%) | −2.310 | −0.863 | −13.565 | 0.000 | |||
| Fe2O3 (%) | 0.777 | 0.181 | 2.839 | 0.008 |
