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    $\begingroup$ It's handy to see this written out. However, I was wondering if there was some sort of 'post-hoc' I could perform to explore and statistically quantify the interaction (i.e. xY:zY is larger than xY:zN)? Sorry if I was unclear. I believe @rolando2 goes some way towards explaining how to do this within the context of multiple regression. $\endgroup$ Commented Nov 23, 2014 at 17:27