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Table 1 Actual and coded levels of independent variables used in the Plakett–Burman design

From: Statistical optimization of chitinase production by Streptomyces rubiginosus SP24 and efficacy of purified chitinase to control root-knot nematode infection in Vigna radiata under controlled conditions

Factor Name Units (g/100 ml) Low actual High actual Low coded High coded
A Colloidal chitin % 0.1 1 − 1 1
B Peptone g 0.1 2 − 1 1
C Beef extract g 0.1 2 − 1 1
D Xylose g 0.2 2 − 1 1
E Sucrose g 0.2 2 − 1 1
F Magnesium sulfate g 0.1 0.5 − 1 1
G Dihydrogen potassium phosphate g 0.1 0.4 − 1 1
H Calcium carbonate g 0.1 0.5 − 1 1