1–8
9–16
17–24
25
26
27–34
35–42
43–50
51
52
53–60
61–68
69–76
77
78

X
1
±1

0
0
0
0
±1
0
0
0
0
±1
0
0
0
0

0
±1
0
0
0
±1
0
0
0
0
0
0
±1
0
0

X2

0
0
±1
0
0
±1
0
0
0
0
0
±1
0
0
0

X3

±1
0
0
0
0
0
±1
0
0
0
0
±1
0
0
0

X4

0
±1
0
0
0
0
±1
0
0
0
±1
0
0
0
0

X5

0
0
±1
0
0
0
±1
0
0
0
0
0
±1
0
0

X
6

±1
0
0
0
0
0
0
±1
0
0
0
0
±1
0
0

X7

0
±1
0
0
0
0
0
±1
0
0
0
±1
0
0
0

X8

0
0
±1
0
0
0
0
±1
0
0
±1
0
0
0
0

X9

RUN

(Cont’

79–86
87–94
95–102
103
104
105–112
113–120
121–128
129
130

X
1
±1

0
0
0
0
±1
0
0
0
0

0
±1
0
0
0
0
±1
0
0
0

X2

0
0
±1
0
0
0
0
±1
0
0

X3

0
±1
0
0
0
±1
0
0
0
0

X4

0
0
±1
0
0
0
±1
0
0
0

X5

±1
0
0
0
0
0
0
±1
0
0

X
6

0
0
±1
0
0
±1
0
0
0
0

X7

±1
0
0
0
0
0
±1
0
0
0

X8

0
±1
0
0
0
0
0
±1
0
0

X9

RUN

NO.OF
INDEPENDENT
VARIABLES
(FACTORS)

2

3

4

5

6

7

NO.OF
COEFFICIENTS
IN FULL
QUADRATIC

6

10

15

21

28

36

NO. OF TRIALS
IN FULL THREE-
LEVEL
FACTORIAL

9

27

81

243

729

2187

NO. RUNS IN
BOX-BEHNKEN
DESIGN

9

15

27

46

54

62

CENTRAL
COMPOSITE

9

15

25

27

46

80