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International Journal of Interdisciplinary Research

Table 3 The factors and levels of the central composite experiment design

From: Optimization of dyeing parameters of cotton standardized samples for laundry test of dye transfer inhibition program

Factor Unit Code Coding level
− 2 − 1 0 1 2
Dye dosage % (owf) A 3 4 5 6 7
Dyeing temperature °C B 40 50 60 70 80
Sodium sulfate dosage g/L C 70 80 90 100 110
Sodium carbonate dosage g/L D 5 10 15 20 25