Type of Document	Dissertation
Author	Guo, Yong
Author's Email Address	guo@eng.fsu.edu
URN	etd-04102006-222732
Title	Efficient Mixed-Level Fractional Factorial Designs: Evaluation, Augmentation and Application
Degree	Doctor of Philosophy
Department	Industrial and Manufacturing Engineering, Department of
Advisory Committee	Advisor Name Title James Simpson Committee Chair Joseph Pignatiello Committee Member Samuel Awoniyi Committee Member Xufeng Niu Committee Member
Keywords	Mixed-Level Designs Augmentation Qualitative Factor General Balance Metric Design Of Experiments Foldover Minimum Aberration Criterion
Date of Defense	2006-04-07
Availability	unrestricted
Abstract In general, a minimum aberration criterion is used to evaluate fractional factorial designs. This dissertation begins with a comprehensive review and comparison of minimum aberration criteria definitions regarding their applications, relationships, advantages, limitations and drawbacks. A new criterion called the general balance metric, is proposed to evaluate and compare mixed-level fractional factorial designs. The general balance metric measures the degree of balance for both main effects and interaction effects. This criterion is related to, and dominates orthogonality criteria as well as traditional minimum aberration criteria. Besides, the proposed criterion provides immediate feedback and comprehensively assesses designs and has practical interpretations. The metric can also be used for the purpose of design augmentation to improve model fit. Based upon the proposed criterion, a method is proposed to identify the optimal foldover strategies for efficient mixed-level designs. The analysis of mixed-level designs involving qualitative factors can be achieved through indicator variables or contrast coefficients. A regression model is developed to include qualitative factor interactions which have been previously ignored.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    YongGuo.pdf 2.05 Mb 00:09:30 00:04:53 00:04:16 00:02:08 00:00:10