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Table 2 The coded and real value of factors in central composite design

From: Impact of cultivar selection and process optimization on ethanol yield from different varieties of sugarcane

Substrates Factors Symbols Coded variables
-1.41421 -1 0 +1 +1.41421
55, 70 and 74 Temperature (°C) X1 175.9 180 190 200 204.1
Residence time (minutes) X2 2.93 5 10 15 17.07
120 Temperature (°C) X1 180.9 185 195 205 209.1
Residence time (minutes) X2 1.93 4 9 14 16.07