Minitab DOE Tutorial interpretation

As stated before if the interaction is significant

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As stated before, if the interaction is significant, ignore the main effect of these factors and only present the interaction plot. Since the factor “Fiber alignment” has no interaction with other factors, the main effect plot of “Fiber alignment” is meaningful. Thus, the interaction plot of “Lens placement” and “Laser placement”, interaction plot of “Laser placement” and “Laser facet power”, and main effect plot of “Fiber alignment” should be displayed. Plots for the main effects and the interaction effects can be obtained by clicking Stat Æ DOE Æ Factorial Æ Factorial Plots . In the dialogue box, check Main Effect Plots and Interaction Plots . - Click Setup button for Main Effect Plot . In the dialogue box appears, select “Optical output power” for Responses and “Fiber alignment” for Selected factor. Then Click OK. Note that multiple main factors’ effect plot can be setup in the dialogue box although in this example only one factor is displayed. - Click Setup button for Interaction Plot . In the dialogue box appears, select “Laser facet power” and “Laser placement” for Selected factors . Then Click OK. - Click OK again to obtain the plots. - Following same procedure, another interaction plot, “Lens placement” vs. “Laser placement” can be obtained.
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