Skip to main content

Table 3 Experimental design-CCD matrix in coded form and measured value of responses

From: Application of response surface methodology for prediction and modeling of surface roughness in ball end milling of OFHC copper

Test no. Control factors R a % error R z % error
f z a p a e v c Observed value Predicted value Observed value Predicted value
1 − 1 − 1 − 1 −1 0.290 0.288 0.69 1.820 1.815 0.30
2 1 − 1 − 1 −1 0.380 0.382 − 0.53 2.090 2.117 − 1.30
3 − 1 1 − 1 − 1 0.250 0.251 − 0.40 1.440 1.461 − 1.48
4 1 1 − 1 −1 0.340 0.345 − 1.47 1.780 1.764 0.91
5 − 1 − 1 1 − 1 0.590 0.584 0.99 0.256 2.499 2.39
6 1 − 1 1 −1 0.590 0.591 − 0.14 2.660 2.636 0.89
7 − 1 1 1 − 1 0.520 0.529 − 1.85 2.090 2.145 − 2.65
8 1 1 1 −1 0.550 0.536 2.51 2.250 2.283 − 1.46
9 −1 −1 − 1 1 0.320 0.329 − 3.00 1.830 1.855 − 1.34
10 1 −1 − 1 1 0.390 0.381 2.26 2.150 2.157 − 0.33
11 −1 1 − 1 1 0.290 0.292 − 0.86 1.480 1.501 − 1.43
12 1 1 − 1 1 0.340 0.344 − 1.24 1.790 1.804 − 0.77
13 −1 −1 1 1 0.610 0.603 1.10 2.650 2.689 − 1.46
14 1 −1 1 1 0.570 0.568 0.44 2.860 2.826 1.17
15 −1 1 1 1 0.550 0.549 0.24 2.330 2.335 − 0.23
16 1 1 1 1 0.510 0.513 − 0.57 2.440 2.473 − 1.34
17 −2 0 0 0 0.430 0.426 0.88 2.040 2.007 1.59
18 2 0 0 0 0.480 0.485 − 0.96 2.450 2.447 0.10
19 0 −2 0 0 0.520 0.526 − 1.19 2.620 2.651 − 1.18
20 0 2 0 0 0.440 0.435 1.23 2.010 1.944 3.27
21 0 0 − 2 0 0.170 0.163 4.18 1.290 1.261 2.26
22 0 0 2 0 0.620 0.628 − 1.27 2.620 2.614 0.22
23 0 0 0 − 2 0.430 0.431 − 0.28 2.010 2.013 − 0.12
24 0 0 0 2 0.450 0.447 0.09 2.280 2.242 1.64
25 0 0 0 0 0.700 0.696 0.61 3.670 3.653 0.47
26 0 0 0 0 0.690 0.696 − 0.83 3.640 3.653 − 0.35
27 0 0 0 0 0.690 0.696 − 0.83 3.620 3.653 − 0.91
28 0 0 0 0 0.700 0.696 0.61 3.680 3.653 0.74
29 0 0 0 0 0.690 0.696 − 0.83 3.670 3.653 0.47
30 0 0 0 0 0.700 0.696 0.61 3.660 3.653 0.19
31 0 0 0 0 0.700 0.696 0.61 3.630 3.653 − 0.63