SPSS is unfortunately not able to easily illustrate your interaction of your hierarchical regression analysis. However, plotting interaction has not to be tedious or even difficult.

This Excel tool helps you to plot first-order (two-way) as well as second-order (three-way) interactions by simply copy and paste your SPSS output into an Excel file. Further, you can also easily test if the slopes differ from Zero (i.e. simple slope tests and simple slope difference tests).

Video tutorials will show you how to proceed to get your interactions plotted in only a few minutes.

All starts with a nice SPSS output of your regression analysis. Use the following syntax to get all information you need for IRSE: SPSS-Syntax (pdf-file| SPSS-file)

Then, watch the video tutorials. With these tutorials, you learn step by step how to plot your interactions and how to calculate simple slope and simple slope difference tests. The videos are in German, but you can download the transcript of the text.

>> Tutorial 1: General Introduction
>> Tutorial 2: Simple Slope and Simple Slope Difference Tests

The videos are quite big. If you use a slow internet connection, it may take some time to download them completely.
Sometimes the videos do not work at all. In this case, please use the low-quality versions on youtube:
General Introduction | Simple Slope and Simple Slope Difference Tests


If you would like to pay homage to IRSE, you can cite this tool as follows:

Meier, L. L. (2008). IRSE. Interactions in Multiple Linear Regression with SPSS and Excel (Version 1.6) [Computer software and manual]. Retrieved *Date Of Your Download*, from http://www.urenz.ch/irse

Big up to Jacob and Patricia Cohen, Leona Aiken, Steve West and Jeremy Dawson.



I do my best to offer you a nice tool, however, I can not guarantee that there are no bugs and that the plotted slopes as well as the tests are correct. Until now, no user found a mistake. In case you find one, please report it. Further, I am always happy about a short feedback, suggestions for improvement or just a simple 'Thanks, I like it like that!'.
Please use the contact form.
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Best regards, all the best and good luck with your research!
Laurenz Meier, Ph. D. | University of South Florida, Tampa