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st: graphing interaction when direct effect is curvilinear


From   "L.M.A. Mulotte" <L.Mulotte@uvt.nl>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: graphing interaction when direct effect is curvilinear
Date   Wed, 12 Sep 2012 07:48:08 +0000

Dear readers

I would like to graph interaction effects for an OLS when the direct effect is curvilinear. 

Specifically, I would like to graph the impact of Z on the curvilinear relationship between Y and X, for Z being held at means plus 1 one SD and at means minus 1 SD, and all other variables being held constant. I would be very grateful for any advice.

Here is an example showing my problem 

use http://www.stata-press.com/data/r11/nlswork
gen age2 = age*age
gen age2_x_birth_yr= age2*birth_yr (this is the interaction between age and birth_yr)
regress ln_wage age age2 birth_yr age_x_birth_yr age2_x_birth_yr grade i.race i.south

The graph I would like to draw has the following characteristics 
-	Vertical axis is ln_wage
-	Horizontal axis is age
-	one inverted-U shaped curve for birth_yr held at means plus one SD, keeping other variables constant.  
-	one inverted-U shaped curve curve for birth_yr held at means minus one SD, keeping other variables constant.  

Thank you very much for your consideration.

Louis

*****************************************************************************
Louis Mulotte
Organization and Strategy 
 
Tilburg University
School of Economics and Management
PO Box 90153 - 5000 LE - Tilburg - The Netherlands
Room: K1123 / Email: l.mulotte@tilburguniversity.edu / Phone: +31 13 466 8706
*****************************************************************************



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