NUMBER

OFRUNS

REQUIREDTOFIT

A FULL

QUADRATIC

MODEL

NO.OF INDEPENDENT VARIABLES (FACTORS)

2

3

4

5

6

7

NO.OF
COEFFICIENTS
IN FULL
QUADRATIC

6

NO.OFTRIALS IN FULL THREE-
LEVEL
FACTORIAL

9

NO.RUNS IN BOX-BEHNKEN
DESIGN

9

CENTRAL COMPOSITE

9

10

15

21

28

36

27

81

243

729

2187

15

25

27

46

80

15

27

46

54

62