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Interaction Charts (Stacked Mean Line Plots)

Interaction plots are stacks of mean lines, used to display the effect of one experimental factor at each level of another factor. With no or insignificant interaction, the mean lines are approximately parallel. The more the lines deviate from being parallel, the more significant the interaction effect.

Options for Plotting an Interaction Chart

To add error bars to an interaction chart, the options are:

Standard error of mean
Standard deviation
Confidence interval (including options of 90.0%, 95.0%, 97.5%, 99.0%)

Using a Worksheet Layout With Two-Grouping Variables

Here, levels of two grouping variables split the response values from a single numeric column.
You can choose which components of the split should represent the legend entries and which should represent the X-axis labels; in the example below, the legend entries represent levels of the 2^nd grouping variable, the X-axis labels represent levels of the 1^st grouping variable.

An Interaction Chart Displaying the Effect of One Factor at Each Level of Another Factor

Using a Worksheet Layout With One-Grouping Variables

Here, levels of a grouping variable split the response values from multiple numeric columns.
You can choose which components of the split should represent the legend entries and which should represent the X-axis labels; in the example below, the legend entries represent levels of the grouping variable, the X-axis labels represent the response variables.