From kimai at Princeton.Edu  Tue Nov  4 03:43:42 2014
From: kimai at Princeton.Edu (Kosuke Imai)
Date: Mon, 3 Nov 2014 21:43:42 -0500
Subject: [Mediation-information] Two-Step Mediation
In-Reply-To: <CALQOJRD=Q4JSWeikLq_majD2XhSP5ZVp9+5t2Xg8VzLemRrFew@mail.gmail.com>
References: <CALQOJRD=Q4JSWeikLq_majD2XhSP5ZVp9+5t2Xg8VzLemRrFew@mail.gmail.com>
Message-ID: <CAFiYZ5xKjeTKDHrrfFsPmqVObz9R07zMq=39_BE6OcUGm+B5jQ@mail.gmail.com>

Dear Peter,

It depends on what you would want to estimate, but it's certainly possible
to do this under certain assumptions.  For example, you can estimate the
indirect effect of treatment on outcome through either mediator 1 or 2.
It's also possible to estimate the indirect effect of treatment on
mediation 2 through mediator 1.

Kosuke

---------------------------------------------------------
Kosuke Imai               Office: Corwin Hall 036
Professor                 Phone: 609-258-6601
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Princeton University      Email: kimai at Princeton.Edu
Princeton, NJ 08544-1012  http://imai.princeton.edu
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On Sun, Nov 2, 2014 at 4:21 PM, Peter Ronald Belmi <peterbelmi at gmail.com>
wrote:

> Hi Dr. Imai,
>
> Can I use the mediation package if I have a model that's something like
> this:
>
> Treatment -> Mediator 1 -> Mediator 2 -> DV
>
> Is there a way to test the indirect effect in this model?
>
> Cheers,
> Peter
>
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