5. Process Improvement

5.4.	Analysis of DOE data

Contents of this section

Assuming you have a starting model that you want to fit to your experimental data and the experiment was designed correctly for your objective, most DOE software packages will analyze your DOE data. This section will illustrate how to analyze DOE's by first going over the generic basic steps and then showing software examples. The contents of the section are:

• DOE analysis steps
• Plotting DOE data
• Modeling DOE data
• Testing and revising DOE models
• Interpreting DOE results
• Confirming DOE results
• DOE examples
• Full factorial example
• Fractional factorial example
• Response surface example

Prerequisite statistical tools and concepts needed for DOE analyses

The examples in this section assume the reader is familiar with the concepts of

• ANOVA tables (see Chapter 3 or Chapter 7)
• p-values
• Residual analysis
• Model Lack of Fit tests
• Data transformations for normality and linearity