Fraction of design space plots for examining model robustness

Ayca Ozol-Godfrey, Christine M. Anderson-Cook, Douglas Montgomery

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


When choosing between competing designs, it is typical to specify a design space and model on which to base the comparison. The prediction capabilities of the design, specifically G- and V-efficiency using scaled prediction variance (SPV), are based on this chosen model. After the data are collected and individual effects are tested, some terms may not be significant in the model. In this case, the experimenter likely will decide to use a reduced model, which has only a portion of the terms included that were in the original model for which the design was chosen. This paper presents a graphical method for examining design robustness related to the SPV values using fraction of design space (FDS) plots by comparing designs across a number of potential models in a prespecified model space. The FDS plots show the various distributions of the SPV throughout the design space for different models for a chosen design on the same graph. The methods are demonstrated on several examples for different models and on a variety of design spaces.

Original languageEnglish (US)
Pages (from-to)223-235
Number of pages13
JournalJournal of Quality Technology
Issue number3
StatePublished - Jul 2005


  • Alphabetical Optimality Criteria
  • FDS Plot
  • Mixture Experiments
  • Model Reduction
  • Response Surface Designs
  • Scaled Prediction Variance

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Strategy and Management
  • Management Science and Operations Research
  • Industrial and Manufacturing Engineering


Dive into the research topics of 'Fraction of design space plots for examining model robustness'. Together they form a unique fingerprint.

Cite this