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. 2007 Feb;8(2):98–104. doi: 10.1631/jzus.2007.B0098

Table 3.

Levels of the variables tested in CCD

Variables Coded levels
−1.682 −1 0 1 1.682
Ammonium sulfate, X1 8.3 9.0 10.0 11.0 11.7
Glucose, X2 83.2 90.0 100.0 110.0 116.8
Nicotinic acid, X3 5.8 6.5 7.5 8.5 9.2

X 1=(x 1−10)/1; X 2=(x 2−100)/10; X 3=(x 3−7.5)/1