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
Mesos
1.5
2.5
Minors
2.25
4
BAP
1.75
3
IBA
0.05
0.13
0.2