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From |
"Iyer, Neeraj N" <niyer@purdue.edu> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
Re: Re: st: RE: SEM with bootstrapping for analysis of mediation |

Date |
Wed, 11 Jul 2012 20:13:56 -0400 |

Dear Phil, Thank you. I did not want to assume that the direct and indirect effects would be adjusted for the covariates; your note is helpful in that regard. However, in the command line sem (MV <- IV CV1 CV2 CV3 CV4 ) (DV <- MV IV CV1 CV2 CV3 CV4), I was unable to fathom how STATA would know which one of IV/CV1/CV2/CV3/CV4 is the true Indep. Var. In other words, since " IV CV1 CV2 CV3 CV4" are common to both paths how can STATA differentiate between the variables, which will answer the question, "Whose indirect effect are we observing"? Hence, I was looking for bootstrap CI for the indirect effect of each individual variable, or a partitioned bootstrap CI. Is this partitioning plausible? Thanks and regards, Neeraj On Wed, Jul 11, 2012 at 7:49 PM, Philip Ender <ender97@gmail.com> wrote: ... However when I ran a mediation model with one IV and 4 other covariates i.e. sem (MV <- IV CV1 CV2 CV3 CV4 )(DV <- MV IV CV1 CV2 CV3 CV4), the bootstrap confidence intervals I obtained were for the overall direct, indirect and total effects and not broken down by each variable. I wish to obtain the bootstrap CI separately for my IV adjusted for other covariates. Any thoughts about approaching this problem? Another question is why is the seed set at 358395? What is this number's significance? ... Dear Neeraj, Since the covariates CV1-CV4 are included in each of the two equations of the -sem- command in the -indirect.ado program the direct and indirect effects are adjusted for these four covariates. I'm not sure what you are asking for when you say you wish to obtain the bootstrap CI separately for my IV adjusted for other covariates. The -set seed- is included so that readers can reproduce the results from the example. The number has no special meaning. -- Phil Ender UCLA Statistical Consulting Group * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ -- Neeraj * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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