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Table 3 Regression coefficients, R2, adjusted R2 and F-values for dependent variables

From: Optimization protocol for the extraction of 6-gingerol and 6-shogaol from Zingiber officinale var. rubrum Theilade and improving antioxidant and anticancer activity using response surface methodology

  constant linear quadratic Interaction     
Responses b0 b1 b2 b12 b22 b12 R2 R2 (adjusted) Regression (F value) Lack of fit (F value)
Y1 1.53 0.51 0.25 0.27 0.0092 0.31 0.97 0.95 45.91** 4.12 n.s
Y2 1.2 0.15 0.12 0.021 0.024 0.15 0.93 0.92 15.58** 1.39 n.s
Y3 71.88 9.22 2.78 3.16 1.11 4.63 0.96 0.94 15.79** 1.24 n.s
  1. n.s non significant
  2. ** = significant at p < 0.01