Dataset: surface_finish.dat Source: R. Levi (1965). "Evaluation of Machining Conditions by Factorial Experiment," International Journal of Machine Tool Design and Research, Vol.5,pp.217-221. Description 2^4 factorial experiment relating 4 factors to roughness on the finish of ground steel pieces (profilomerer readings, micr-inches AA) measured across wheel marks. Low values are considered best. Factors: A=Hardness 0 = 220 Brinell 1 = 62 Rockwell C B=Table Feed (ft/min) 0 = 32.8 1=82 C=Wheel mark pattern 0 = Cross-hatched 1 = Parallel D=Cutting Fluid Type 0 = M, 1 = S Variables/Columns A 8 B 16 C 24 D 32 Roughness 34-40