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Design-Expert v11

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Design-Expert » Hints and FAQs

Hints and FAQs¶

  • Creating a Design
    • Entering Missing data
    • Changes to the design
    • Can’t run one combination of factor levels
    • Messed-up coding levels
    • Planning a two-factor experiment
    • Too many runs on Multilevel Categoric designs
    • How Many Levels Do I Need?
  • Putting Data In and Getting Results Out
    • Importing/Exporting Data
    • Analyzing historical data (data mining)
    • View alias structure for pre-existing design
    • Fitting more than one model to a response
    • Journaling
  • Making Output Look Nice
    • Formatting Data
    • Display problems - lines breaking on reports
  • Interpreting the Analysis
    • No significant effects
    • Green triangles on Half Normal Plot
    • Working with Factorial Screening Designs
    • Working with Mixture screening Designs
  • Coping with Unusual Outcomes
    • No lack-of-fit info
    • Predicted R-squared more than 0.2 lower than Adjusted R-squared
    • Negative Adjusted R-squared
    • Zero desirability in numerical optimization
    • Different results than outside calculations
  • When All Else Fails
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