
 Question:
 Does the primary factor (X1) have an effect?
 What is the optimal level of the primary factor?
 Definition:
 Vertical Axis : Response
 Horizontal Axis: Nuisance (secondary) factors (X2, X3, X4)
 Plot character : Primary factor (X1)
 Interpretation/Conclusion:
 Factor 1 (X1) is statistically significant
 The optimal setting for factor 1 is X1 = 2
 There is no interaction between X1 and the 3 nuisance factors
 There exist 2 outlying (X2,X3,X4) conditions:
 (X2,X3,X4) = (1,1,2) and (2,2,1)
 NIST/SEMATECH Handbook Chapter:
 1.
Exploratory Data Analysis
 5.
Process Improvement
 Reference:
 Filliben
