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st: graphing interaction when direct effect is curvilinear
From
"L.M.A. Mulotte" <[email protected]>
To
"'[email protected]'" <[email protected]>
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
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Louis Mulotte
Organization and Strategy
Tilburg University
School of Economics and Management
PO Box 90153 - 5000 LE - Tilburg - The Netherlands
Room: K1123 / Email: [email protected] / Phone: +31 13 466 8706
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