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Re: st: Compare Inverted U-shape curves

From   Maarten Buis <>
Subject   Re: st: Compare Inverted U-shape curves
Date   Thu, 10 May 2012 11:32:05 +0200

On Wed, May 9, 2012 at 10:43 PM, Alexander James
<> wrote:
> In accordance with what I expected, I find a non-linear relationship (inverted U-shape) between my main independent and the dependent (the non-squared positive and the squared term negative). Moving a step further,
> I interact the main IV (both squared and non-squared) with another continuous variable to see how it changes the inverted U-shape relationship.
> I was asked to plot the two curves (the interacted and the non-interacted) and compare how the curve changes. Would someone have a suggestion about how I should do it?

Here are a number of examples:

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
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