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Table 3 The factor coding and levels of the Box–Benhnken design

From: Studies on cellulase-ultrasonic assisted extraction technology for flavonoids from Illicium verum residues

Factors

Real value

Coding

Levels

−1

0

1

C

X1

x 1

40

50

60

B

X2

x 2

15

20

25

D

X3

x 3

4

5

6

  1. x1 = (X1 − 50)/10; x2 = (X2 − 20)/5; x3 = (X3 − 5)/1
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BMC Chemistry

ISSN: 2661-801X

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