Definitive Screening Design (DSD)
Modern screening design with 3 levels that additionally resolves curvature and isolated two-factor interactions.
Also known as: Definitive Screening Design, Jones-Nachtsheim design
A Definitive Screening Design (Jones & Nachtsheim, 2011) is a three-level screening plan with typically runs for factors. Unlike classical two-level screening designs, it kills two birds with one stone: identifying important main effects and cleanly estimating curvature plus isolated active two-factor interactions.
- Structure: three levels per factor (−1, 0, +1); one centre run plus two "foldover" runs per factor
- Separability: main effects are orthogonal to all two-factor interactions and quadratic terms
- Parsimony — only 2 extra runs per factor; 6 factors need just 13 runs (vs. 64 full factorial)
See also
Used in
In the Algorithm Lab
Sources
- Jones, B. & Nachtsheim, C. J. — A Class of Three-Level Designs for Definitive Screening in the Presence of Second-Order Effects, Journal of Quality Technology, 43(1), 2011
- Jones, B. & Nachtsheim, C. J. — Definitive Screening Designs with Added Two-Level Categorical Factors, Journal of Quality Technology, 45(2), 2013