Understanding the Effect of Confounding in Design of Experiments: A Case Study in High-Speed Weaving


Johnson, Roy; Clapp, Tim; Baqai, Navaid   (1989, Marcel Dekker, Inc. and ASQC)   North Carolina State University, Raleigh, NC;

Quality Engineering    Vol. 1    No. 4
QICID: 15076    April 1989    pp. 501-508
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Article Abstract

[This abstract is based on the author's abstract.]

The application of design of experiment techniques for process optimization is examined. Emphasis is given to confounding effects when partial factorial designs are used. Four factors are examined to determine their impact on the tenacity or breaking strength of fabric constructed in a high-speed weaving process. At first, a half-fractional factorial of a 2(superscript 4) design is used to identify significant effects. Two main effects and two interaction effects were found to be significant. Because each of the interactions is confounded with others, it was necessary to run the remaining half of the 2(superscript 4) design to separate confounded effects. Engineers using design of experiment techniques are provided with an application where effects of confounding must be considered.


Case study, Fractional factorial design

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