This is Dataplot data file boxsprings_3_8.dat Defective Springs 2**3 (k=3,n=8)
Oven Temp / Carbon Conc / Quench Temp Effect on Spring Cracks
Reference--Box & Bisgaard, The Scientific Context of
Quality Improvement. Quality Progress,
June 1987, page 56.
2**3 Full Factorial Design
Response variable = percent acceptable springs
Number of observations = 8
Number of variables per line image = 4
Order of variables on a line image--
1. Response variable Y = % of springs without cracks
2. Factor 1 = oven temp (2 levels: 1450 & 1600 F)
3. Factor 2 = carbon conc (2 levels: .5 & .7 %)
4. Factor 3 = quench temp (2 levels: 70 & 120 F)
To read this file into Dataplot--
SKIP 25
read boxsprings_3_8.dat Y X1 X2 X3
Y X1 X2 X3
Percent Oven Carbon Quench
Acceptable Temp Conc Temp
----------------------------------------
67 -1 -1 -1
79 +1 -1 -1
61 -1 +1 -1
75 +1 +1 -1
59 -1 -1 +1
90 +1 -1 +1
52 -1 +1 +1
87 +1 +1 +1