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Re: Re: st: binary mediation command


From   Pina Valle <gv08d@fsu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: Re: st: binary mediation command
Date   Tue, 05 Jul 2011 12:37:21 -0400

Philip,
Yes that was helpful, as that is what my co-author and I believed as well from a website on binary mediation. One last question..when using the bootstrap CI, and getting a CI for the indirect effect that does not include zero, we then can report proportion of total effect mediated. However, proportion of total effect mediation is -.084. Would we still report 8.5% or does the negative mean something else?

Thank you.
Pina 

----- Original Message -----
From: Philip Ender <ender97@gmail.com>
Date: Tuesday, July 5, 2011 11:12 am
Subject: Re: Re: st: binary mediation command
To: statalist@hsphsun2.harvard.edu

> Dear Pina,
> 
> You didn't include the bootstrap results for the direct and indirect
> effects so I can only give general advice.  Check the bootstrap
> confidence intervals for your direct and indirect effects.  In
> particular, look at your indirect effects because it seems rather
> small.  If the confidence interval does not include zero then you can
> report the proportion of total effect mediated.  If, on the other
> hand, the confidence interval includes zero then the proportion
> mediated is essentially meaningless since the indirect effect is not
> reliably different from zero.
> 
> I hope this response helps.
> 
> 
> Pina Valle wrote:
> >Even when using percentile confidence intervals, is this output 
> relevant since I am trying to determine the >proportion mediated 
> by the indirect effect?
> 
> >Indirect effects with binary response variable evercoh
> >        indir_1 = .00601173        (adrel, binary)
> >total indirect  = .00601173
> >direct effect  = .10223182
> >total effect  = .10824356
> >      c_path   = .10680445
> >proportion of total effect mediated = .05553895
> >ratio of indirect to direct effect  = .05880491
> >Binary models use logit regression
> 
> >Thanks
> >Pina
> 
> -- 
> Phil Ender
> UCLA Statistical Consulting Group
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Giuseppina Valle, M.S. 
Department of Sociology
Doctoral Candidate
Florida State University
526 Bellamy Building
Tallahassee, FL 32306-2240

Email:   gv08d@fsu.edu 
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