5.4.4. How to test and revise DOE models

5. Process Improvement
5.4. Analysis of DOE data

5.4.4. How to test and revise DOE models

An outline (with links) covers most of the useful tools and procedures for testing and revising DOE models

All the tools and procedures for testing, revising and selecting final DOE models are covered in various sections of the Handbook. The outline below gives many of the the most common and useful techniques and has links to detailed explanations.

Outline of Model Testing and Revising: Tools and Procedures

Graphical Indicators for testing models (using residuals)

Overall numerical indicators for testing models and model terms

R Squared and R Squared adjusted
Model Lack of Fit tests
ANOVA tables (see Chapter 3 or Chapter 7)
p-values

Model selection tools or procedures

ANOVA tables (see Chapter 3 or Chapter 7)
p-values
Residual analysis
Model Lack of Fit tests
Data transformations for normality and linearity
Stepwise regression procedures
Normal or half-normal plots of effects (primarily for two level full and fractional factorial experiments)
Youden plots
Other methods