Design & Factor Selection
Design Types & Categories
Fractional Factorial Design - (FFD) A FFD is a factorial experimental design that is a regular fraction (1/2, 1/4, 1/8,...; 1/3, 1/9, 1/ 27,....; 1/5, 1/25,...), a 3/4 fraction or an irregular unbalanced fraction of a complete factorial design.
A fractional factorial design is obtained by aliasing factor interactions with one another, which prevents independent estimate of their effect.
Learn more about the DOE tools for designed experiments in Six Sigma Demystified (2011, McGraw-Hill) by Paul Keller, in his online Intro. to DOE short course (only $99) or online Advanced Topics in DOE short course (only $139), or his online Black Belt certification training course ($875).