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Table 1 Experimental range and levels of independent variables

From: Optimization and comparison of -aminobutyric acid (GABA) production by LAB in soymilk using RSM and ANN models

  Actual factor level at coded factor levels at
Variables with designates Code −2 − 1 0 +1 + 2
Glucose (%) X1 0.5 0.75 1 1.25 1.5
MSG (%) X2 0.5 0.75 1 1.25 1.5
Incubation period (h) X3 24 36 48 60 72
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