Design & Factor Selection
Design Types & Categories
Hierarchical Designs - Designs in which factor-levels are successively nested within other factor-levels to form a run. The nesting need not be symmetrical. Graphically, this resembles a tree structure.
Hierarchal designs may sometimes be more conveniently analyzed as blocked designs.
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).