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Re: st: binary mediation command

From   Pina Valle <>
Subject   Re: st: binary mediation command
Date   Sun, 03 Jul 2011 15:44:09 -0400

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


----- Original Message -----
From: Philip Ender <>
Date: Wednesday, June 15, 2011 4:21 pm
Subject: Re: st: binary mediation command

> Pina Valle wrote:
> >I am trying to test mediation with a dichotomous outcome, and I 
> have looked around and found a command in >STATA called 
> binary_mediation. However, there isn't really any indication in the 
> notes I found on whether the >mediation is significant. Here is an 
> example of my output along with the commands that I have used:
> >...
> The documentation for -binary_mediation states:  This program does not
> provide standard errors or statistical tests for coefficients.
> Bootstrap standard errors and confidence intervals are recommended for
> this purpose.
> Using either the percentile or bias corrected confidence intervals,
> whichever you prefer, intervals that contain zero are not significant
> at the stated level while those that do not contain zero are
> significant.  Traditional statistical tests are likely to lead to
> biased p-values.  I think the confidence interval approach is safer.
> Phil
> -- 
> 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

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