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RE: st: moderated mediation logistic outcome
From
Richard Williams <[email protected]>
To
[email protected]
Subject
RE: st: moderated mediation logistic outcome
Date
Fri, 28 Oct 2011 12:17:08 -0500
At 10:37 AM 10/28/2011, Cameron McIntosh wrote:
Tobias,
I don't know about the precise Stata code for estimating a mod-med
model, but I would caution you that if you are using a series of
logistic regression steps to test for the presence of moderated
mediation, you will need to account for the fact that the variance
of the outcome depends on the model (and will change across
equations as predictors and interactions terms are added) -- all
this due to the identification constraint that error = pi-squared/3
= 3.29. This also means that coefficients will be recaled to respect
the constraint, and will thus need to be standardized to allow for
comparisons across equations. Note that the same issue applies to
the probit case with error = 1.0. You may wish to see:
You may also wish to look at the -khb- program (available from SSC)
and the papers related to it. You may need to write the authors to
get copies of the papers, as I believe they have 2 pieces that are
currently forthcoming and some others that are in progress.
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME: (574)289-5227
EMAIL: [email protected]
WWW: http://www.nd.edu/~rwilliam
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