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st: binary_mediation - a clarification


From   Paula Arce <paulaarce@rocketmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: binary_mediation - a clarification
Date   Thu, 25 Oct 2012 13:45:05 +0100 (BST)

Hi There, 


I have used the binary_mediation command with 500 bootstrap cycles.  The output shows me that the proportion of the total effect mediated is equal to 27% (the direct x--> y regression also shows that x does predict y). 


However, the 95%CIs for the indirect effect contain 0 (CIs: -.01 to .14), which then suggests that mediation is not occurring. 


I am slightly confused by these results - should I only look at the proportion value if I find evidence that supports the presence of an indirect effect?

Thanks,
Paula


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