Response surface central composite design (CCD) and their experimental results.

Run	Actual values				Coded values				Response
	X 1	X 2	X 3	X 4	X 1	X 2	X 3	X 4	Actual	Predicted
1	20	8	0.2	30	0	0	0	−1	85.60	87.93
2	10	11	0.1	30	−1	+1	−1	−1	66.30	63.90
3	10	5	0.3	90	−1	−1	+1	+1	67.90	69.46
4	20	8	0.3	60	0	0	+1	0	88.70	86.90
5	20	11	0.2	60	0	+1	0	0	65.30	67.12
6	30	5	0.1	90	+1	−1	−1	+1	66.20	64.70
7	30	11	0.1	30	+1	+1	−1	−1	63.40	61.86
8	30	11	0.3	30	+1	+1	+1	−1	60.30	60.64
9	10	5	0.1	90	−1	−1	−1	+1	66.80	66.44
10	30	11	0.1	90	+1	+1	−1	+1	59.80	60.72
11	10	11	0.3	30	−1	+1	+1	−1	60.40	61.92
12	10	8	0.2	60	−1	0	0	0	92.80	92.26
13	10	11	0.3	90	−1	+1	+1	+1	62.90	61.93
14	10	5	0.3	30	−1	−1	+1	−1	68.20	67.25
15	30	5	0.3	30	+1	−1	+1	−1	65.90	64.72
16	30	5	0.3	90	+1	−1	+1	+1	66.10	68.48
17	10	5	0.1	30	−1	−1	−1	−1	66.00	66.93
18	20	8	0.1	60	0	0	−1	0	84.20	86.00
19	20	5	0.2	60	0	−1	0	0	73.60	71.78
20	30	5	0.1	30	+1	−1	−1	−1	62.70	63.64
21	10	11	0.1	90	−1	+1	−1	+1	60.00	61.21
22	20	8	0.2	90	0	0	0	+1	90.80	88.47
23	30	8	0.2	60	+1	0	0	0	90.20	90.74
24	30	11	0.3	90	+1	+1	+1	+1	63.10	62.20