Re: st: sem mediation analysis - categorial mediator

[John Antonakis <John.Antonakis@unil.ch>]

Hi:

If your mediator is endogenous, which it probably is, then you need to 
use an instrumental variable estimator that can handle the type of model 
you have.  -sem- or -gsem- can do this for you. If you model two 
"discrete" equations where the disturbances are assumed to be 
orthogonal, the model is potentially misspecified.

Check out -cmp-, available from -ssc-; it can handle multinomials as 
mediators (multinomial probit in fact, that does not differ much from 
logistic).

Else (not a good thing to say here), Mplus can handle such models with 
the WLSMV estimator:

Muthén, B. O., du Toit, S. H. C., & Spisic, D. in press. Robust 
inference using weighted least squares and quadratic estimating 
equations in latent variable modeling with categorical and continuous 
outcomes. Psychometrika.

HTH,
J.

__________________________________________

John Antonakis
Professor of Organizational Behavior
Director, Ph.D. Program in Management

Faculty of Business and Economics
University of Lausanne
Internef #618
CH-1015 Lausanne-Dorigny
Switzerland
Tel ++41 (0)21 692-3438
Fax ++41 (0)21 692-3305
http://www.hec.unil.ch/people/jantonakis

Associate Editor:
The Leadership Quarterly
Organizational Research Methods
__________________________________________

On 19.03.2014 08:04, reitersa@cms.hu-berlin.de wrote:
> I did an mediation analysis in STATA 12 with sem. My dependent variable is
> "life satisfaction" (continuous) and my mediator variable is "employment
> status" (categorial (four categories)). (And I use several independent
> variables.)
> Do you know how STATA is handling the path from the independent variable
> on the mediator? If I would not test this path with structural equation
> modeling I had to test it with a multinomial logistic regression. So I do
> interpret my output coefficients of that specific path as relative risk
> ratios or like the regression coefficients of the other paths (e.g.
> mediator -->DV)?
> Maybe you can recommend me some literatur on that topic. That would be great!
>
>    Thank you very very much, Sabrina
>
>
>
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