Overview for Factorial Plots

Use Factorial Plots to create main effects and interactions plots to show the results of a two-way ANOVA.
  • Use a main effects plot to display fitted means for the categorical factors in a two-way ANOVA in order to show how the factors are related to the continuous response.
  • Use an interaction plot to show how the relationship between one categorical factor and a continuous response depends on the value of the second categorical factor. This plot displays fitted means for the levels of one factor on the x-axis and a separate line for each level of another factor.

You must perform a two-way ANOVA in Minitab Express before you can use this analysis. To create the factorial plots, Minitab Express uses the most recent two-way ANOVA model that you fit for the response.

For example, researchers at a motor vehicle bureau want to illustrate their two-way ANOVA results that find a significant interaction effect between driver experience and road type on the number of steering corrections.

Where to find this analysis

  • Mac: Statistics > ANOVA > Factorial Plots
  • PC: STATISTICS > Factorial Plots

When to use an alternate plot

Factorial plots create graphs with fitted means from a two-way ANOVA model. If you did not perform a two-way ANOVA in Minitab Express, you do not have a model to use. You can create Main Effects Plot and Interaction Plot with data means instead of fitted means.

For more information, go to Comparison of data means and fitted Means.

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