Fold Over Design

Fold-Over Design - A type of fractional factorial design in which a base design is augmented by a design of the same size, with the augmenting part being the complement of the base design. A single fold over increases the resolution of the design. Multiple holdovers become replicates.

See also: Variance of the Fitted Response

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).