[Mediation-information] Mediation-information Digest, Vol 25, Issue 5

[Mashhood Sheikh]

Hi,

What I do not understand yet is why we need a package like multimed if we can decompose a model with two causally dependent mediators (infant deprivation --> education level --> economic position --> aging well) into two models (infant deprivation --> education level --> aging well & education level --> economic position --> aging well).

I can not comment on this. Bit beyond my expertise. 

But if deprivation conditions education strongly, I could end not finding any direct nor indirect effect of education on aging well.

Yes, that may happen. The estimates will be biased if you exclude potential confounders. 

---
Mashhood Ahmed Sheikh
Research Fellow, 
Department of Community Medicine,
Faculty of Health,
University of Tromsø,
Norway



----------------------------------------
> From: mediation-information-request at lists.r-forge.r-project.org
> Subject: Mediation-information Digest, Vol 25, Issue 5
> To: mediation-information at lists.r-forge.r-project.org
> Date: Wed, 27 Aug 2014 12:00:24 +0200
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> 1. Re: Mediation-information Digest, Vol 25, Issue 3
> (Angel Rodriguez)
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> Message: 1
> Date: Wed, 27 Aug 2014 11:38:53 +0200
> From: "Angel Rodriguez" <angel.rodriguez at matiainstituto.net>
> To: <mediation-information at lists.r-forge.r-project.org>
> Subject: Re: [Mediation-information] Mediation-information Digest, Vol
> 25, Issue 3
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> <8564BCD7D26E0D40872F1A132C8BBB250258B231 at MATIAEXCH.matiaf.local>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Thank you again, Mashhood.
>
> What I do not understand yet is why we need a package like multimed if we can decompose a model with two causally dependent mediators (infant deprivation --> education level --> economic position --> aging well) into two models (infant deprivation --> education level --> aging well & education level --> economic position --> aging well).
>
> Following your advise, I should include infant deprivation as a confounder in the model education level --> economic position --> aging well. But if deprivation conditions education strongly, I could end not finding any direct nor indirect effect of education on aging well.
>
> Best regards,
>
> Angel Rodriguez-Laso
>
>
> -----Mensaje original-----
> De: mediation-information-bounces at lists.r-forge.r-project.org en nombre de Mashhood Sheikh
> Enviado el: mar 26/08/2014 20:56
> Para: mediation-information at lists.r-forge.r-project.org
> Asunto: Re: [Mediation-information] Mediation-information Digest, Vol 25,Issue 3
>
>
> Hi,
>
> In the model (education level --> economic position --> aging well) you should include all the variables that potentially confound the association between education level and economic position, education level and ageing well, and economic position and ageing well.?
>
> Best wishes,
> Mashhood
> ---
> Mashhood Ahmed Sheikh
> Research Fellow,
> Department of Community Medicine
> Faculty of Health,
> University of Troms?,
> Norway
>
>
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