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Table 5 level of factors according to Box–Behnken Design

From: Combining gene expression programming and genetic algorithm as a powerful hybrid modeling approach for pear rootstocks tissue culture media formulation

Factors

Coded variable level

Low

Mid

High

− 1

0

1

KNO3

0.5

1.25

2

NH4NO3

0.5

1.25

2

Mesos

0.5

1.5

2.5

Minors

0.5

2.25

4

BAP

0.5

1.75

3

IBA

0.05

0.13

0.2