Optimality

Optimality - Commonly used measures of the "goodness" or "quality" of a design, as compared to some standard, are D-, G- and A-Optimality. Optimality addresses only the predictive characteristics of a design for factor effects. It does not measure the capability of a design to estimate experimental error and lack of fit, or dispersion, which requires repeated runs or replicated designs. The effect of repetition or replication is to reduce the optimality of the design.

See also: Design Performance Indices

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).