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# st: 3D plot for interaction effects

 From James Bernard To statalist@hsphsun2.harvard.edu Subject st: 3D plot for interaction effects Date Wed, 23 Jan 2013 18:37:29 +0800

```Hi all,

I am struggling with plotting main effect and interaction effect of my
negative-binomial model... I though Stata might have something, given
the popularity of these plots among empiricists

This is a a fixed effect negative binomial model.... I have pace as my
main ID, Pace-squared, then an interaction term "Scale" and then
interaction of that variable with Pace and Pace-Squared.

I want to draw this where my DV is on the vertical axis and main plot
on the X and then interaction on Y (like a surface plot). I wonder if
this can be done in Stata, given that negative binomial is a nonlinear
model....

----------------------------------------------------------------------------------------
lagpatent_f1 |      Coef.   Std. Err.      z    P>|z|
[95% Conf. Interval]
-----------------------+----------------------------------------------------------------
Pace      |   1.494223   .5783452     2.58   0.010
.3606869    2.627758
Pace^2      |  -.6852545   .2394282    -2.86   0.004
-1.154525   -.2159839
Scale            |   .0563032   .3031137     0.19   0.853
-.5377887     .650395
Pace*Scale          |  -1.551876   .8982472    -1.73   0.084
-3.312408    .2086566
Pace*Scale^2        |    .849984   .4441609     1.91   0.056
-.0205553    1.720523

_cons |   .5746716   .2601009     2.21   0.027
.0648832     1.08446

Many Thanks,
james
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```

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