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Table 1 Levels of variables for optimization

From: Application of response surface methodology (RSM) in statistical optimization and pharmaceutical characterization of a patient compliance effervescent tablet formulation of an antiepileptic drug levetiracetam

Code Variables Level of variables
− 1 0 + 1 − α + α
X1 Citric acid 320 640 960 187.45 1092.55
X2 Effersoda 320 640 960 187.45 1092.55