Just keep multiplying
Reference: 
YouTube. (2019, January 21). Statistical rethinking winter 2019 lecture 09. YouTube. https://www.youtube.com/watch?v=QhHfo6-Bx8o&amp;list=PLDcUM9US4XdNM4Edgs7weiyIguLSToZRI&amp;index=9. 

How to Deal with Higher Order Interactions

Shade and water can both affect bloom. Yet, shade may also affect (has interaction) with water.

Ohio State University, Columbus

Take the TRIPTYCH for example. We can see although there are movements of lines on the top section, the slope did not change very much because the "interaction" was canceled (turned off). Yet in the bottom section, the slope with water may also change when the shade changes.

Two Models: with Interaction and without Interaction

McElreath, R. (2020). Statistical Rethinking: A Bayesian Course with Examples in R and STAN (2nd ed.). Chapman and Hall/CRC.

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