Hello I wanted to develop an alternative regression equation just to prove that my first regression equation is a better fit.
I want to show the possibility that my independent variables my be interacting with each other. To show that I wanted to plot an interaction graph.
I will first write the multiple regression equation and then the interaction plot and also the resulting plot.
> interact_plot(Poly, pred = x2, modx = x1) Warning message: -1.13290847281745 is outside the observed range of x1
What does this warning message mean?
And I do not really know how to interpret this? Does this mean they are no interacting? Do they have to meet at some point?
Thanks for your help, really in need.