Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down at the end of May, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

st: Re: Graph interaction of two countinous variables


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: Graph interaction of two countinous variables
Date   Thu, 18 Oct 2012 12:27:20 +0200

On Thu, Oct 18, 2012 at 12:02 PM, D.V.Vo wrote me privately:

> I am Dut, a PhD student at University of Groningen, the Netherlands. I think
> you have much experience about the graph interaction in Stata through the
> forum. Therefore, I would like to ask your favor to share that experience
> with me. Could you please help me about this?
> I have the logistic and tobit  regression models:
>  1. Logit (Y) = X1 (continuous variable) + X2 (continuous variable) + X1*X2
> + control variables
>  2. Logit (Y) = X1^2 (continuous variable) + X2 (continuous variable) +
> X1^2*X2 + control variables
>  3. Tobit (Y) = X1 (continuous variable) + X2 (continuous variable) + X1*X2
> + control variables
>  4. Tobit (Y) = X1^2 (continuous variable) + X2 (continuous variable) +
> X1^2*X2 + control variables
>  These independent and moderate variables are standardized, with these
> models, after regression, how can I graph the interaction effects in Stata?
> Could you please share with me about specific command in Stata that could do
> these for me?
> In the case, the above independent and moderate variables are not
> standardized, how can I graph the interaction effects in Stata for this
> case?

Such questions need to be sent directly to Statalist, not its
individual members. For reasons why that is the case see:
<http://www.stata.com/support/faqs/resources/statalist-faq/#private>.
That FAQ gives you all the information you need on how to join and how
to ask questions on the list.

There is a whole set of examples on how to do what you ask for various
versions of Stata here:
<http://www.maartenbuis.nl/wp/inter_quadr/inter_quadr.html>.

You seem to add x1^2 without adding x1; that seems unusually
restrictive and probably wrong.

-- Maarten

---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany

http://www.maartenbuis.nl
---------------------------------
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index