Table 4.
Regression coefficients of second order polynomial equations showing relationships among response variables and independent variables
| Coefficient | Yield | Water activity | WAI | WSI | Hardness | Delta-E | OAA |
|---|---|---|---|---|---|---|---|
| Intercept | |||||||
| β0 | +1.01 | +9.63 | −0.06 | +2.28 | +0.27 | +0.19 | +0.06 |
| β2 | -1.58 | -0.09 | +0.24 | −3.20 | +2.13 | -0.55 | +0.11 |
| β3 | -8.03 | -0.23 | +0.08 | −5.74 | +17.10 | +6.15 | +0.17 |
| Interaction | |||||||
| β12 | -0.02 | +8.33 | −9.17 | −1.06 | -0.05 | -1.25 | -8.33 |
| β13 | -0.04 | -5.84 | −4.75 | +1.75 | -0.22 | -0.15 | -2.51 |
| β23 | +0.17 | +5.83 | −0.01 | +5.00 | +0.31 | -0.03 | -0.02 |
| Quadratic | |||||||
| β11 | -4.36 | -3.06 | +3.92 | −1.29 | +0.01 | +4.25 | -4.04 |
| β22 | +0.06 | +1.04 | −9.52 | −4.54 | +0.12 | +0.03 | +5.44 |
| β33 | +0.59 | +7.54 | +0.05 | −1.65 | +0.74 | -0.03 | +0.03 |
WAI = Water absorption index, WSI = Water solubility index, H = Hardness of noodles, OAA = Overall acceptability, ΔE (delta E) = Total colour change