Observed responses and predicted values of CNF yield.

Run	Variables levels				Response value (CNF yield) (%)
	A	B	C	D	Experimental	Predicted
1	0 (3)	0 (110)	0 (80)	0 (30)	85.0	84.4
2	1 (4)	0 (110)	−1 (60)	0 (30)	72.0	71.9
3	0 (3)	0 (110)	0 (80)	0 (30)	83.3	84.4
4	−1 (2)	0 (110)	−1 (60)	0 (30)	68.0	70.4
5	0 (3)	−1 (100)	0 (80)	1 (40)	49.3	51.4
6	0 (3)	0 (110)	1 (100)	−1 (20)	71.4	70.7
7	−1 (2)	−1 (100)	0 (80)	0 (30)	47.6	47.5
8	−1 (2)	1 (120)	0 (80)	0 (30)	64.6	65.6
9	−1 (2)	0 (110)	1 (100)	0 (30)	66.3	69.2
10	1 (4)	0 (110)	0 (80)	−1 (20)	71.4	70.8
11	0 (3)	−1 (100)	1 (100)	0 (30)	57.8	54.8
12	0 (3)	0 (110)	1 (100)	1 (40)	74.8	76.4
13	1 (4)	1 (120)	0 (80)	0 (30)	69.7	71.1
14	0 (3)	1 (120)	−1 (60)	0 (30)	68.0	66.8
15	0 (3)	0 (110)	−1 (60)	1 (40)	62.9	63.4
16	0 (3)	−1 (100)	−1 (60)	0 (30)	52.7	51.2
17	0 (3)	0 (110)	−1 (60)	−1 (20)	76.5	76.3
18	0 (3)	1 (120)	0 (80)	1 (40)	61.2	61.9
19	0 (3)	1 (120)	0 (80)	−1 (20)	71.4	72.1
20	0 (3)	1 (120)	−1 (60)	0 (30)	74.8	72.1
21	0 (3)	−1 (100)	0 (80)	−1 (20)	47.6	49.7
22	1 (4)	0 (110)	−1 (60)	0 (30)	81.6	81.8
23	1 (4)	0 (110)	0 (80)	1 (40)	79.9	78.4
24	1 (4)	−1 (100)	0 (80)	0 (30)	56.1	56.3
25	−1 (2)	0 (110)	0 (80)	1 (40)	62.9	59.3
26	0 (3)	0 (110)	0 (80)	0 (30)	85.0	84.4
27	−1 (2)	0 (110)	0 (80)	−1 (20)	78.2	75.5