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st: graph interaction curve

From   Fabio Zona <>
Subject   st: graph interaction curve
Date   Fri, 25 Feb 2011 17:10:47 +0100 (CET)


I am really having hard time to graph an interacion between a curve and a linear moderator.

this is the equation:

Y = a + X +  X^2  + moderator  +  X * moderator

Is there an easy way to graph the curve and see how it changes, for different values of the moderator?

Also, I have another equation (more complex) with the same challenge:
Y = a + X +  X^2  + moderator  +  X*moderator  + X^2 * moderator

Thanks a lot!

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