# st: marginal effects after mvprobit

 From "Stephen P. Jenkins" To Subject st: marginal effects after mvprobit Date Mon, 19 Mar 2007 23:57:05 -0000

```> Date: Sat, 17 Mar 2007 19:11:36 +0000
> From: "stata_user stata_user" <stata_dofile@hotmail.co.uk>
> Subject: st: marginal effects after mvprobit
>
> Hi all,
>
> I have a question about how to get marginal effects after mvprobit,
> I have three binary outcomes, I run the mvprobit , and I
> would like to
> obtain the marginal effects for p111,p110 .... in order to
> interpret my
> outputs.
>
>
> Thanks a lot for any help,
>
> Sami
>

This is a non-trivial exercise (just look at the relevant section of
the -biprobit- entry in the Manuals)

What you could do is derive a predicted probability for whichever
outcome combination you were interested in, given a particular set of
covariates. Then recalculate the predicted probability with a marginal
change in one covariate holding all the others at the value used in
the first calculation. This gives a change in predicted probability.
-mvppred- after -mvprobit- gives you the ability to calculate Prob
that each binary outcome = 1, and Prob that each binary outcome = 0.
(If you want other outcome combinations, then you would need to use
_gmvnp(): see Cappellari & Jenkins article in Stata Journal 6(2) --
preprint at ISER website under working papers.)

Stephen (co-author of -mvprobit-)
----------------------
Professor Stephen P. Jenkins <stephenj@essex.ac.uk>
Institute for Social and Economic Research (ISER)
University of Essex, Colchester, CO4 3SQ, UK
Tel: +44 (0)1206 873374. Fax: +44 (0)1206 873151.
http://www.iser.essex.ac.uk
Survival Analysis Using Stata:
http://www.iser.essex.ac.uk/teaching/degree/stephenj/ec968/index.php

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/
```