Dataset: pulppaperbleach.csv Source: R. Sridhar, V. Sivakumar, V. Prince Immanuel, J. Prakash Maran (2012). "Development of Model for Treatment of Pulp and Paper Industry Bleaching Effluent Using Response Surface Methodology," Environmental Progress & Sustainable Energy, Vol. 31, #4, pp. 558-565. Description: Results of a Box-Behnken design with 4 factors, each at 3 levels, and 3 response variables. Factors: Current density (mA/cm^2) Initial pH Elecrolyte Concentration (g/l) Electrolysis time (min) Responses: % Colour Removal % Chemical Oxygen Demand (COD) Removal % Biochemical Oxygen Demand (COD) Removal Variables/labels Run Number (runnum) Current Density (X1) Initial pH (X2) Electrolyte Concentration (X3) Electrolysis Time (X4) % Colour Removal (colour) % COD Removal (cod) % BOD Removal (bod) Coded Current Density (XC1) Coded Initial pH (XC2) Coded Electrolyte Concentration (XC3) Coded Electrolysis Time (XC4)