**To create interaction plots or graphs with two variables**

- It is important to carefully organize the data into columns as shown in the example below. The first column
contains information for the x-axis and is the levels (concentrations or codes) used for the first factor in the
GLM. The remaining columns contain the measurement data for each cell in the table.

Data for the x-axis |
Level 1 |
Level 2 |
Level 3 |

Level 1 |
measurement data |
measurement data |
measurement data |

Level 2 |
measurement data |
measurement data |
measurement data |

Level 3 |
measurement data |
measurement data |
measurement data |

- Proceed through the chart wizard as for other graphs.
- For interaction plots select a
**scatter plot with the lines connected**. **Error bars will be added separately for each line.**Use care when adding error bars. Make sure the data you enter goes with the line you used to activate the**Format Data Series**option.**The caption should have a**This means p values should be given for both factors and the interaction**complete**reporting of the GLM.**.**