Transcription of Chapter 3: Two-Level Factorial Design
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Chapter 3: Two-Level Factorial Design
Chapter 3 is excerpted from DOE Simplified: Practical Tools for Effective Experimentation, 2nd Edition by Mark Anderson and Patrick Whitcomb, 3-1 Chapter 3: Two-Level Factorial Design If you do not expect the unexpected, you will not find it. Heraclitus If you have already mastered the basics discussed in chapters 1 and 2, you are now equipped with very powerful tools to analyze experimental data. Thus far we ve restricted discussion to simple, comparative one-factor designs. We now introduce Factorial Design a tool that allows you to experiment on many factors simultaneously. The Chapter is arranged by increasing level of statistical detail.
The simplest factorial design involves two factors, each at two levels. The top part of Figure 3-1 shows the layout of this two-by-two design, which forms the square “X-space” on the left. The equivalent one-factor-at-a-time (OFAT) experiment is shown at the upper right. Figure 3-1: Two-level factorial versus one-factor-at-a-time (OFAT)
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