pg_0161
5.
Process Improvement
5.4.
Analysis of DOE data
5.4.4.
How to test and revise DOE models
Tools for
testing,
revising,
and
selecting
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 most common and useful techniques
and has links to detailed explanations.
Outline of Model Testing and Revising: Tools and Procedures
An outline
(with links)
covers most
of the useful
tools and
procedures
for testing
and revising
DOE models
Graphical Indicators for testing models (using residuals)
Response vs predictions
r
Residuals vs predictions
r
Residuals vs independent variables
r
Residuals lag plot
r
Residuals histogram
r
Normal probability plot of residuals
r
q
Overall numerical indicators for testing models and model terms
R Squared and R Squared adjusted
r
Model Lack of Fit tests
r
ANOVA tables (see
Chapter 3
or
Chapter 7
)
r
p-values
r
q
Model selection tools or procedures
ANOVA tables (see
Chapter 3
or
Chapter 7
)
r
p-values
r
Residual analysis
r
Model Lack of Fit tests
r
Data transformations for
normality
and
linearity
r
Stepwise regression procedures
r
q
5.4.4. How to test and revise DOE models
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