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  • Mediation Analysis - SEM/MEDSEM vs. KHB

    Hello dear STATALIST forum,

    I hope you have started the new year well and can assist me with a problem.
    I am currently working on a project in which I am trying to observe the impact of child poverty on work values. My focus is on mediating effects through personality and parenting style.

    All my variables are ordinal (quasi-metric) scaled. I have calculated a Structural Equation Model (SEM) with multiple mediators (Big 5 & Supp. Parenting Scale) and interpreted it using the MEDSEM command.

    During a presentation in a team meeting, it was suggested that I should try to replicate the same relationships using the KHB method.
    The results differ significantly. While occasional mediation effects (according to Baron/Kenny and Zhao, Lynch & Chen) are visible in the SEM model, this is not the case in the KHB Decomposition.

    I have the following questions:
    • What can account for the differences?
    • Is there an error in my SEM or KHB input?
    • Which results should I report? Is there a good reason to prefer SEM/MEDSEM results over KHB results?
    Thank you in advance!
    Best regards,
    Marcel

    Code:
    *SEM (Bootstrap & Robust standard Errors)
    *Mediation-Effects of Childhood poverty (pgarmut_1_bis_5) via Personality/Parentingstyle (gew ope extr vert neur loc m_par f_par) on Importance of Work-Life-Balance (BW_wl_bala)
    
    bootstrap, reps(1000): sem (BW_wl_bala<-gew ope extr vert neur loc m_par f_par pgarmut_1_bis_5 mpgbilzeit fpgbilzeit fpgexpue mpgexpue migback_re dehhinc_10 bez gejobbt Berufl_Ausb sex) (gew<-pgarmut_1_bis_5) (ope<-pgarmut_1_bis_5) (extr<-pgarmut_1_bis_5) (vert<-pgarmut_1_bis_5) (neur<-pgarmut_1_bis_5) (loc<-pgarmut_1_bis_5) (m_par<-pgarmut_1_bis_5) (f_par<-pgarmut_1_bis_5), nocapslatent vce(robust) 
    
    medsem, indep(pgarmut_1_bis_5) med(loc) dep(BW_wl_bala) mcreps(5000) rit rid zlc
    
    
    *KHB 
    khb ologit BW_wl_bala gew ope extr vert neur loc m_par f_par mpgbilzeit fpgbilzeit fpgexpue mpgexpue migback_re dehhinc_10 bez gejobbt Berufl_Ausb sex || pgarmut_1_bis_5
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