

Categorical DV in mediation analysis 

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YuChang posted on Monday, September 12, 2011  3:00 am



Hi,would you like help me for 2 question? I have a mediation model: one continuous IV, one continuous nediator variable and one threecategory DV. I used model indirect and STDYX command in Mplus 6.After run, I found two things I couldnt understand: 1. In StdYX Estimate output, there is only Estimate,NO S.E..Why? Is the standardized formula same as binary DV of mediation analysis£¿as MacKinnon's paper£¨2007£©mentioned? 2. In the indirect output, how can we interpret unstandardized indirent effect? Thanks for your sincerely reply. Yu Chang 


1. With WLSMV and covariates, we do not give standard errors for standardized estimates. Yes, the forumla is the same. 2. The interpretation is the same as for a regression coefficient, the change in y for a one unit change in x. 

WenHsu Lin posted on Tuesday, November 24, 2015  7:19 pm



Hi, Mplus team, would you mind to help me on mediation. My model: 3 Xs, 1 mediating variable, which as three categories (a), and 1 distal outcome variable (y) (count variable). My model: X1 X2 X3> a>y x1 x2 x3>y How do I get: (1) the effects of each X on a (2) how do I get each the effects of each category of a on y, and finally (3) the mediating from x through a to y? Do I use known class command? Thank you. 


For (1) and (3), see the paper on our website: Muthén, B. & Asparouhov, T. (2015). Causal effects in mediation modeling: An introduction with applications to latent variables. Structural Equation Modeling: A Multidisciplinary Journal, 22(1), 1223. DOI:10.1080/10705511.2014.935843 For (3), you could do a separate analysis of y regressed on 2 dummy variables representing a. 

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