Interactions: IVs = continuous & continuous IVs = continuous & categorical.
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Transcript of Interactions: IVs = continuous & continuous IVs = continuous & categorical.
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Interactions:
IVs = continuous & continuousIVs = continuous & categorical
![Page 2: Interactions: IVs = continuous & continuous IVs = continuous & categorical.](https://reader035.fdocuments.net/reader035/viewer/2022080902/56649cff5503460f949d0410/html5/thumbnails/2.jpg)
What we already know…
Interactions: IVs = categorical & categorical
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Interactions (continuous)
![Page 4: Interactions: IVs = continuous & continuous IVs = continuous & categorical.](https://reader035.fdocuments.net/reader035/viewer/2022080902/56649cff5503460f949d0410/html5/thumbnails/4.jpg)
Interactions (continuous)
Can be done in SPSS with some tweaking:
Center the variables (X minus mean) Create interaction term (multiple them together) Put all three variables into “regression”
• V1 centered• V2 centered• V3 = new interaction “variable”
![Page 5: Interactions: IVs = continuous & continuous IVs = continuous & categorical.](https://reader035.fdocuments.net/reader035/viewer/2022080902/56649cff5503460f949d0410/html5/thumbnails/5.jpg)
Multiple Regression
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Graphs
You can tweak SPSS some more to create “graphs” of “+1SD” and “-1SD” but very tedious.
I would recommend this software:
http://www.danielsoper.com/Interaction/default.aspx
Costs $5. Super easy. Gives both “output” and “graphs”. I’ll show you how to use it when you want to run interactions on your data