| Fractional Factorial Designs with Blocks and Center Points |
Interaction Plot
The interaction plot is described in detail in the section "Interaction Plot", and the use of the interaction plot with fractional factorial designs is described in the section "Interaction Plot".
Click Explore and then the Interaction Plot tab. It is best to examine the alias structure of the design before using this plot.
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The plots for TEMP*TIME and TIME*ETCH indicate interaction effects that might be significant. Since the three-factor interaction FLOW*ETCH*ACID is aliased with the two-factor interaction TEMP*TIME, you would need to assume that FLOW*ETCH*ACID is not active if you test TEMP*TIME for significance. Otherwise, these two effects should be explored further; see Chapter 13, "Special Topics," for further details.
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