Re: st: Fw: Multiple mediation

[John Antonakis <John.Antonakis@unil.ch>]

Oh, OK (though I wouldn't qualify what you show below as mediation 
because you are using sureg and not reg3 or 2sls). I'd use it more in 
this context:

reg3 (z_read z_ses) (z_ses z_write )
testnl [z_ses]z_write*[z_read]z_ses=0

Anyway.....is the procedure you show using the delta method to calculate 
the significance of the indirect path?

Also, how would one bootstrap the SE of the indirect path?

Best,
J.
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Prof. John Antonakis
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On 06.02.2009 20:36, Maarten buis wrote:
> --- On Fri, 6/2/09, John Antonakis <John.Antonakis@unil.ch> wrote:
>   
> > Do you mean testnl, Maarten?
> >     
>
> Yes, my bad.
>  
>   
> > Also, could you just us how, specifically one would test
> > for indirect effects in the context of reg3?
> >     
>
> *------------------ begin example ----------------------
> use http://www.ats.ucla.edu/stat/stata/notes/hsb2, clear
> foreach var of varlist read ses write {
> 	sum `var' if !missing(read,ses,write)
> 	gen double z_`var' = (`var' - r(mean))/r(sd)
> }
> sureg (z_read z_ses) (z_write z_read z_ses)
> testnl [z_read]z_ses*[z_write]z_read = 0
> nlcom  [z_read]z_ses*[z_write]z_read
> *--------------- end example ---------------------------
> (For more on how to use examples I sent to the Statalist, see
> http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )
>
> -- Maarten
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting address:
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>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
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