| Code=variables (Unit) |
“better to best” Independent (Space=Coded) Levels |
| X1=PDAB(ml) |
4.00 (-1=1) |
5.00 (0=2) |
6.00 (+1=3) |
| X2= FeCl3 (ml) |
5.00 (-1=1) |
6.00 (0=2) |
7.00 (+1=3) |
| Dependant |
Constraints |
| Y1 = Absorbance |
0.56≤Y1≥0.71 |
| Design Results |
| Runs-Code |
Variables |
| Independent |
Dependent (Y1) Response (R1) |
| X1 |
X2 |
Observed |
Predicted |
| BB-1 |
1.00 |
1.00 |
0.665 |
0.670 |
| BB-2 |
2.00 |
1.00 |
0.571 |
0.570 |
| BB-3 |
3.00 |
1.00 |
0.601 |
0.600 |
| BB-4 |
1.00 |
2.00 |
0.640 |
0.640 |
| BB-5 |
1.00 |
3.00 |
0.592 |
0.590 |
| BB-6 |
2.00 |
3.00 |
0.581 |
0.580 |
| BB-7 |
3.00 |
2.00 |
0.658 |
0.660 |
| BB-8 |
2.00 |
2.00 |
0.586 |
0.590 |
| BB-9 |
2.00 |
2.00 |
0.590 |
0.590 |
| BB-10 |
2.00 |
1.00 |
0.564 |
0.570 |
| BB-11 |
2.00 |
2.00 |
0.590 |
0.590 |
| BB-12 |
2.00 |
2.00 |
0.589 |
0.590 |
| BB-13 |
3.00 |
3.00 |
0.705 |
0.700 |
| Surface Design (3D) Best Model |
| Terms |
Model |
X1 |
X2 |
X1X2 |
X12 |
X22 |
Lack of Fit |
| F value |
383.4 |
63.4 |
33.40 |
691.65 |
1061.8 |
37.20 |
1.70 |
| Intercept |
0.59 |
0.011 |
0.0076 |
0.0445 |
0.064 |
-0.012 |
|
| p. value (Prob>F) |
0.0001 |
0.0007 |
. < 0.0001 |
< 0.0001 |
0.0005 |
0.3040 |
| R-Square |
Adjusted R2 |
Predicted R2 |
Std. Dev |
%CV |
| 0.996 |
0.994 |
0.982 |
0.0035 |
0.67 |
| F-value Less than 0.0500 indicate model terms are significant and Lack of fit value Greater than 0.1000 indicate the model terms are not significant |